But it was mocked by Conservative supporters for echoing Labour's left-wing 1983 election manifesto, described at the time by one Labour lawmaker as "the longest suicide note in history" for helping the Conservatives to victory.
Opponents will question the basis for this when we are talking about a Westminster general election but there is no doubt that the final manifesto will be the clearest attempt yet to differentiate the party in Wales from the party in England.
May's decision to call an early election for next month caught not only most of her own party by surprise, but has forced Labour and other parties to scramble to devise policies and campaigns nearly overnight.
"So far during this campaign we have learned one thing about Jeremy Corbyn: proud and patriotic working class people in towns and cities across Britain have not deserted the Labour Party - Jeremy Corbyn has deserted them" - from a speech Theresa May will deliver to mark the campaign's midpoint.
Labour is also set to pledge councils to build 100,000 new homes a year.More news: 5 moments Donald Trump and James Comey were at odds
With some moderate Labour MPs reported to be in revolt over Mr Corbyn's radical programme of renationalisation and expanding public services, Mrs May will accusing him of a return to the "disastrous socialist policies of the 1970s".
The draft manifesto, which runs to 43 pages, also contains promises of £6bn-a-year extra for the NHS and £1.6bn-a-year for social care.
But it has emerged that shadow cabinet members were only given the section of the draft manifesto which specifically related to their brief, meaning none of them had access to the full document.
Labour is expected to finalise its manifesto at the Clause V meeting on Thursday, but the extraordinary leak of the policy document saw details released a week ahead of its planned publication in a blow to the party's campaign strategy.
Among the policies included are plans to nationalise the railways, parts of the energy industry and scrap tuition fees.More news: No US Open homecoming for former Cowboys QB Tony Romo
Past elections show that voters support the party which is the most united and the most economically credible - two lessons which today's Labour Party has still to learn.
"We respect that parents and grandparents taught their children and grandchildren that Labour was a party that shared their values and stood up for their community".
A Conservative spokesman said: "This is a total shambles".
Mr Corbyn has insisted "Britain is leaving the European Union" but the manifesto rules out breaking away from Brussels without a deal.
"Jobs will be lost, families will be hit and our economic security damaged for a generation if Jeremy Corbyn and the coalition of chaos are ever let anywhere near the keys to Downing Street".More news: Apple Adding iTunes To Windows Store
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