Waspi women have had the "door slammed in their faces" as Labour's first Budget failed to address redress for the group.
Campaigners gathered outside parliament on Wednesday to demand action on redress as the Budget was delivered by chancellor Rachel Reeves.
However women born in the 1950s who saw state pension age rise from 60 to 65 were disappointed not to see redress included in the Budget.
Angela Madden, chair of Women Against State Pension Inequality (Waspi), said: "Millions of women’s retirement plans were thrown into chaos, many suffering extreme financial and mental hardships and this is why we are here today.
“Affected women have been vindicated by the Parliamentary Ombudsman’s report, parliament must compensate all affected women, yet months on we’re yet to receive an official response from the Labour party."
In the House of Commons, following the budget, Dave Doogan, SNP MP for Angus and Perthshire Glens, called it a "wait-a-little-longer Budget for Waspi women".
He told FT Adviser: "It is right, just and welcome that those affected and effected by the contaminated blood scandal and those postmasters damaged by the Horizon scandal have seen their compensation funded in this Budget.
“But is beyond credibility that the Waspi women have had the same door slammed in their faces by another iteration of the UK government.
“I pressed the last government on the need to compensate fully and quickly but was told that the government needed to think carefully about where the money would come from. Taxes were already the highest in living memory before the Budget and now the chancellor has applied the biggest tax hike since 1993.
"If there is no money in this Budget then it beginning to look like the UK government has no intention of compensating the Waspi women."
The Waspi Campaign is now backed by Liberal Democrat leader Ed Davey and Green Party co-leader Carla Denyer.
Denyer said: "The previous government kicked the can down the road, and now the Labour Party must act. With the chancellor failing to commit to compensate those affected today, and tens of thousands of pensioners struggling to make ends meet, ministers must urgently set out their plans to compensate those affected."
In March, the Parliamentary and Health Service Ombudsman ruled women affected by state pension age changes are owed compensation by the government.
Davey said ministers must now "urgently implement" the findings of the report "without further delay".
tara.o'connor@ft.com
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