For hours they poured off coaches and out of Euston and other stations as over 100,000 people - some estimates were as high as 250,000 - streamed to London in order to march in defence of the NHS. Stop STPs 'slashing, trashing and privatising our NHS' was repeatedly chanted by the predominantly working-class marchers and from the platform. The Socialist Party's placards 'build a movement to save our NHS - campaign, strike, occupy' were all snatched up.
Video: interviews with Hannah Sell, Jacqui Berry and Mike Forster
The demonstration was organised from below; initiated by local health campaigns via the Health Campaigns Together umbrella group. Mike Forster, Socialist Party member and chair of one local campaign that helped initiate the demo, 'Hands off Huddersfield Royal Infirmary (HRI)', described how he had first raised the idea on a protest of a few hundred the previous autumn. Across the country the Socialist Party mobilised all-out for the demonstration - distributing over 100,000 leaflets advertising the 4 March.
While the demonstration was initiated by community campaigns, there were also large contingents of trade unionists. By the day of the march, 13 national trade unions had supported the demonstration. Three general secretaries - Len McCluskey of Unite, Mark Serwotka of the PCS, and Dave Ward from the CWU addressed the march. Shamefully, Dave Prentis, the general secretary of the biggest health union, Unison, did not speak and the union's leadership only belatedly and half-heartedly supported the march. It was a different story among Unison members, however, who came to the march in their tens of thousands.
Without doubt the size and determination of the demonstration will have given confidence to health workers that it is possible to win the battle to save our NHS; not only to stop the current, potentially fatal, round of cuts and privatisation but to kick out the privateers leaching the NHS dry.
The Socialist Party gave out 30,000 leaflets on the demonstration calling for the march to be the first step of a mass campaign to save our NHS. We sold over 1,000 copies of the Socialist.
Young Socialist Party members led a youth and student contingent, together with Socialist Students. Socialist Party member and disabled people's activist Amaliah Loizidou spoke on the platform of the disabled and pensioners' shorter march.
Throughout the day we pointed out that the Tory government - with a tiny majority and an unelected prime minister - is weak and can be defeated. The NHS STPs (Sustainability and Transformation Plans) could become Theresa May's poll tax. We called for a national day of action with massive local demonstrations in all 44 STP 'footprint' areas to stamp on the STPs. The idea that such a day of action could take place on 1 May was raised from the main stage.
We also demanded that the trade union movement and the Labour leadership call a second - even bigger - national demonstration, using the full power of the TUC's six million plus members to protest in defence of the NHS. Such measures would further boost the confidence of NHS workers to take coordinated strike action against the pay freeze and the destruction of the NHS. Occupations to stop hospital closures could also play a role.
We explained that this movement should not be limited to saving the NHS, but stand for defence of public services as a whole. Peter Taaffe, general secretary of the Socialist Party, spoke at the National Shop Stewards' Network (NSSN) stage outside the Department of Health, saying: "The trade unions should organise a massive demonstration not just in defence of the NHS, but against all the cuts in councils, schools and other public services. This should be a step towards a one-day general strike to show our determination to defeat this government."
The case for coordinated strike action was widely understood by marchers. There was huge support for the heroic junior doctors' strike, and an understanding that future groups of strikers could not be left to fight alone. The case for coordinated strike action was put repeatedly from the NSSN stage.
On the main stage, Jacqui Berry, staff nurse, one of the demo organisers and member of the Socialist Party, put it clearly: "The age of pay restraint has lasted longer than World War Two. If pay restraint continues our unions have to ballot for strike action." She went on: "Today we've made history marching together, but we may well have to strike together."
Mark Serwotka, general secretary of the PCS, also called for coordinated strike action against pay restraint. It is urgent that the left unions come together to discuss making this correct idea a reality.
It is to the credit of Jeremy Corbyn, Labour leader, and John McDonnell, shadow chancellor, that they both supported the demonstration and spoke at it. John McDonnell declared: "Whatever it takes to save the NHS, including industrial action if it takes place, Jeremy Corbyn and I will be with you in parliament and on the picket line."
Jeremy Corbyn rightly pointed out that Nye Bevan and others who founded the NHS faced relentless hostility from the big business supporting media just as fighters for the NHS get denigrated today. The only answer, he rightly declared, "is to say it like it is".
Without doubt leading a movement to save the NHS and oppose austerity would be the most effective way to fight back against the constant attacks that the representatives of the capitalist class are raining down on Jeremy Corbyn. 'Saying it like it is', however, means recognising that the representatives of big business are inside the Labour Party as well as outside it.
The privatisation of the NHS has accelerated under the Tories but went a very long way under New Labour in government via the Private Finance Initiative and other measures. The Blairite politicians are now determined to defeat Corbyn exactly because he was elected on policies that include renationalisation of the NHS.
The morning after this magnificent demo John McDonnell told the Andrew Marr show that he wanted to sit down with Peter Mandelson and Tony Blair and 'have a cup of tea'. To continue to call for unity with the Blairites, who support the private sector profiting from our public services and who aided them doing so when in office, is the very opposite of 'saying it like it is'.
To continue to compromise with the Labour right would inevitably mean continuing to retreat on anti-austerity policies and handing victory to the pro-capitalist elements of the Labour Party.
Fighting for socialist policies, campaigning, as Dave Ward put it, to "take back control of our NHS, our railways, our postal and telecoms services, our workplaces" via democratic public ownership, requires standing up to the Blairites as well as the Tories and the right-wing press.
One immediate step that must be taken is to call on Labour councils to reject the STPs. As Jacqui Berry put it when she spoke: "We've heard from the leader of Hammersmith and Fulham council (which rejects its STP); it would be remiss of me not to ask the leader of the opposition to write to every Labour council asking them to follow its lead." Jeremy didn't refer to Labour councils in his speech, but should now urgently write to them.
Saturday's demonstration was a tremendous success, and an important step to building a movement capable of defeating the Tories. Now it needs to be built upon.
Saturday 4 March will go down in history as the day Britain said 'no!' to NHS funding cuts and closures. Some estimates put the numbers at an incredible 250,000!
This is on a par with the anti-poll tax demos, which helped to force Thatcher out. It could spell the beginning of the end of the Tories if we build on this momentum.
The crowds came from all quarters of the country and flooded Tavistock Square for the opening rally. From the stage it was obvious we were completely swamped by the sheer numbers which continued to swell all day long. The march snaked back the whole one mile route from Euston to Parliament Square.
And all of this from an idea which only took root towards the end of October. When our campaign from Huddersfield met with the Lewisham activists outside the Department of Health following our much smaller gathering of 300 to hand in petitions, we developed the idea of a national demonstration.
This was taken up by Health Campaigns Together (HCT), although not without some hesitation. Previous demos had not met with a big response - but this time the entire climate has changed.
A small group of us have been meeting to plan and organise the event. On a shoestring budget, we have proved people will respond to protests and action.
The mood was dynamic, buoyant and electric. They came from all corners of the country with banners and flags.
The very clear message was: 'we will not let them take our NHS and we are going to fight for it'.
It's vital we kick on from here and use this demonstration to map out a strategy for forcing the Tories back.
HCT will be meeting very soon to organise the next steps and will be reaching out to all health campaigns to get organised and maintain the energy.
Birmingham Central Socialist Party helped organise a Socialist Students coach to get to the demo, while Birmingham South East branch went on the trade union-organised coaches.
Along with the Socialist, we sold well over 50 NHS badges saying "underfunded, understaffed, under attack."
Once in London, we had members on campaign stalls and in the crowd with our papers and banners. Even on the approach to Tavistock Square, it was immediately clear that this event was going to be bigger than the early predictions of 50,000.
The mood of the crowd was striking. NHS workers, people from all walks of life, young people out in force, making clear demands for political change, not lip-service.
Among the union and campaign banners and homemade signs, Socialist Party placards flooded the crowd.
Having pushed hard for this demo to go ahead, with or without the support of the TUC, it was brilliant to see the scale of support, the burgeoning of left ideas and the strength of the intervention of the Socialist Party.
80 people attended the demo from the Save Glenfield Heart Unit campaign in Leicester and had a very vibrant bloc on the march.
Many local campaigners are increasingly seeing the links to the national attacks and the need to link up with trade unions.
We were all really pleased that Unite general secretary mentioned our campaign from the platform.
Socialist Party members from Manchester, Salford and Lancashire divided between three trains and a coach put on to get people to the march.
It was a really good protest, with lots of working class people attending their first demo. People from our area really enjoyed the Socialist Students block and hearing Peter Taaffe speak on the NSSN stage.
Lots of people agreed with the Socialist Party's demand for building campaigns in every STP area. A meeting of Keep Our NHS Public in Manchester in two weeks' time will plan the next steps locally.
Amazing demo - hundreds of thousands marching to stop cuts and privatisation, with a brilliant atmosphere. Just imagine what kind of a movement we could be building if the TUC had officially supported the march and pledged resources to the campaign!
While some of us from the Socialist Party in Cornwall attended the national demonstration, others joined a simultaneous one in Truro.
Around 200 people took part and we sold 13 copies of the Socialist. A Unite member helped us hand out our leaflets.
This version of this article was first posted on the Socialist Party website on 5 March 2017 and may vary slightly from the version subsequently printed in The Socialist.