Part of the problem here is dismissing an actually existing set of conditions - ground in class struggle and relations - as 'nostalgia'.
A historic house building programme, the NHS, near full employment, rising wages and declining levels of inequality, strong levels of community cohesion and social solidarity, the increased access to leisure and comsumer goods and a strong national economy aren't some dewy eyed dream of old people. It was the actual society they grew up in and one which they felt at the centre of: given that they'd defeated fascism and built collective organsiations with such power that capital felt it necessary to offer up all of the above.
Stop dismisisng it as nostalgia and start thinking about how and why it was overhauled - and the organised working class defeated - and how we've then got from there to here. Dismissing the lived experience of people as 'nostalgia' is not only offensive (imagine repacing the word 'old' with 'black community') but its also profoundly ahistorical and wrongly makes invisible the dynamics and social/economic and political processes - a period when we were on the relative front foot.