Jeremy Corbyn is set to claim there is mounting evidence austerity and inequality are “killing people”, in a speech marking the 70th anniversary of the creation of the NHS.

Pledging to “declare war” on health inequality, the Labour leader will also promise to increase funding for the overstretched health service and launch a “national mission” to confront causes of ill health and deprivation.

It comes after Mr Corbyn joined thousands marching through London on Saturday, demonstrating against “deliberate” underfunding of services, nurses and health staff that has “pushed our NHS to the brink”.

Speaking in the Welsh town of Tredegar – the birthplace of the NHS founder Nye Bevan – on Sunday, Mr Corbyn will say: “Labour will declare war on health inequality, both within communities and across our regions and nations.

“As a country, we cannot tolerate a situation where one citizen or one community is denied the chance of life and health of another. That can and must change.”

His remarks follow Theresa May’s announcement last month that the NHS in England will receive an extra £20bn a year by 2023 as a “birthday present”. The prime minister is yet to outline the source of the funding.

While the increase in cash means an average rise of 3.4 per cent a year on the £114bn budget it still falls short of the 3.7 per cent increases the NHS has previously received.

On Sunday, Mr Corbyn will add: “There is clear and mounting evidence that austerity and inequality are killing people.

“For years people were living longer and life expectancy was increasing. That has now ground to a halt and in some parts of the country life expectancy is falling. This is unprecedented.”

“Men in the most deprived parts of England today will have nearly 20 fewer years of their lives in good health.

NHS at 70: demonstration and celebration march to mark anniversary Show all 18 1 /18 NHS at 70: demonstration and celebration march to mark anniversary NHS at 70: demonstration and celebration march to mark anniversary People holding placards attend a demonstration and celebration march to mark the 70th anniversary of the National Health Service (NHS), in central London on June 30, 2018. Organised by the Peoples Assembly, Health Campaigns Together, The TUC and 11 other health trade unions, tens of thousands are expected to attend the only national public event organised to mark the anniversary of the British Health Service. / AFP PHOTO / Tolga AKMENTOLGA AKMEN/AFP/Getty Images TOLGA AKMEN AFP/Getty Images NHS at 70: demonstration and celebration march to mark anniversary Labour Party leader, Jeremy Corbyn, addresses demonstrators following the march AFP/Getty NHS at 70: demonstration and celebration march to mark anniversary A man stands with a coffin, used as a prop at a demonstration and celebration march to mark the 70th anniversary of the National Health Service (NHS), in central London on June 30, 2018. Organised by the Peoples Assembly, Health Campaigns Together, The TUC and 11 other health trade unions, tens of thousands are expected to attend the only national public event organised to mark the anniversary of the British Health Service. / AFP PHOTO / Tolga AKMENTOLGA AKMEN/AFP/Getty Images TOLGA AKMEN AFP/Getty Images NHS at 70: demonstration and celebration march to mark anniversary epa06851663 Thousands of people march, to mark 70 years of the British National Health Service (NHS), in central London, Britain, 30 June 2018. Reports state that the gathering is calling on the government for increased funding and staffing for the NHS, as well as a protest against privatisation of an organisation which turns 70 years old on 05 July 2018. EPA/ANDY RAIN ANDY RAIN EPA NHS at 70: demonstration and celebration march to mark anniversary People holding placards attend a demonstration and celebration march to mark the 70th anniversary of the National Health Service (NHS), in central London on June 30, 2018. Organised by the Peoples Assembly, Health Campaigns Together, The TUC and 11 other health trade unions, tens of thousands are expected to attend the only national public event organised to mark the anniversary of the British Health Service. / AFP PHOTO / Tolga AKMENTOLGA AKMEN/AFP/Getty Images TOLGA AKMEN AFP/Getty Images NHS at 70: demonstration and celebration march to mark anniversary A man wears an NHS themed hat during a march in support of the National Health Service, in central London, Britain, June 30, 2018. REUTERS/Simon Dawson SIMON DAWSON Reuters NHS at 70: demonstration and celebration march to mark anniversary Demonstrators hold placards during a march in support of the National Health Service, in central London, Britain, June 30, 2018. REUTERS/Simon Dawson SIMON DAWSON REUTERS NHS at 70: demonstration and celebration march to mark anniversary epa06851662 A man with a birthday placard as thousands of people march, to mark 70 years of the British National Health Service (NHS), in central London, Britain, 30 June 2018. Reports state that the gathering is calling on the government for increased funding and staffing for the NHS, as well as a protest against privatisation of an organisation which turns 70 years old on 05 July 2018. EPA/ANDY RAIN ANDY RAIN EPA NHS at 70: demonstration and celebration march to mark anniversary Demonstrators stand in Whitehall during a march in support of the National Health Service, in central London, Britain, June 30, 2018. REUTERS/Simon Dawson SIMON DAWSON REUTERS NHS at 70: demonstration and celebration march to mark anniversary People march in central London to mark the 70th anniversary of the NHS. PRESS ASSOCIATION Photo. Picture date: Saturday June 30, 2018. See PA story INDUSTRY Demonstration. Photo credit should read: John Stillwell/PA Wire John Stillwell PA NHS at 70: demonstration and celebration march to mark anniversary Demonstrators hold placards during of a march in support of the National Health Service, in central London, Britain, June 30, 2018. REUTERS/Simon Dawson SIMON DAWSON REUTERS NHS at 70: demonstration and celebration march to mark anniversary People holding placards attend a demonstration and celebration march to mark the 70th anniversary of the National Health Service (NHS), in central London on June 30, 2018. Organised by the Peoples Assembly, Health Campaigns Together, The TUC and 11 other health trade unions, tens of thousands are expected to attend the only national public event organised to mark the anniversary of the British Health Service. / AFP PHOTO / Tolga AKMENTOLGA AKMEN/AFP/Getty Images TOLGA AKMEN AFP/Getty Images NHS at 70: demonstration and celebration march to mark anniversary Demonstrators hold placards during a march in support of the National Health Service, in central London, Britain, June 30, 2018. REUTERS/Simon Dawson SIMON DAWSON REUTERS NHS at 70: demonstration and celebration march to mark anniversary Jeremy Corbyn and Jon Ashworth speak during a march in central London, marking the 70th anniversary of the NHS. PRESS ASSOCIATION Photo. Picture date: Saturday June 30, 2018. See PA story INDUSTRY Demonstration. Photo credit should read: John Stillwell/PA Wire John Stillwell PA NHS at 70: demonstration and celebration march to mark anniversary People holding placards attend a demonstration and celebration march to mark the 70th anniversary of the National Health Service (NHS), in central London on June 30, 2018. Organised by the Peoples Assembly, Health Campaigns Together, The TUC and 11 other health trade unions, tens of thousands are expected to attend the only national public event organised to mark the anniversary of the British Health Service. / AFP PHOTO / Tolga AKMENTOLGA AKMEN/AFP/Getty Images TOLGA AKMEN AFP/Getty Images NHS at 70: demonstration and celebration march to mark anniversary People holding placards attend a demonstration and celebration march to mark the 70th anniversary of the National Health Service (NHS), in central London on June 30, 2018. Organised by the Peoples Assembly, Health Campaigns Together, The TUC and 11 other health trade unions, tens of thousands are expected to attend the only national public event organised to mark the anniversary of the British Health Service. / AFP PHOTO / Tolga AKMENTOLGA AKMEN/AFP/Getty Images TOLGA AKMEN AFP/Getty Images NHS at 70: demonstration and celebration march to mark anniversary People gather with placards to attend a demonstration and celebration march to mark the 70th anniversary of the National Health Service (NHS), in central London on June 30, 2018. Organised by the Peoples Assembly, Health Campaigns Together, The TUC and 11 other health trade unions, tens of thousands are expected to attend the only national public event organised to mark the anniversary of the British Health Service. / AFP PHOTO / Tolga AKMENTOLGA AKMEN/AFP/Getty Images TOLGA AKMEN AFP/Getty Images NHS at 70: demonstration and celebration march to mark anniversary People gather with placards to attend a demonstration and celebration march to mark the 70th anniversary of the National Health Service (NHS), in central London on June 30, 2018. Organised by the Peoples Assembly, Health Campaigns Together, The TUC and 11 other health trade unions, tens of thousands are expected to attend the only national public event organised to mark the anniversary of the British Health Service. / AFP PHOTO / Tolga AKMENTOLGA AKMEN/AFP/Getty Images TOLGA AKMEN AFP/Getty Images

“And this isn't about rich London and the southeast versus the rest of Britain. There is massive inequality in even the wealthiest parts of our country.”