I've ummed and arred over a timeline set in post-war Britain where the revisionist right-wing of the Labour Party comes to dominate led by Hugh Dalton, with Gaitskell by his side. Basically Labour wins the 1950/1 election and rides the post-war boom for the next decade. Dalton was arguably more a dirigist than a socialist and certainly held strong nationalist beliefs, so I assumed his Prime Ministership would follow those lines.
Notably he was iffy over nationalisations and preferred to 'test' industry to ensure efficency. In 1947 when he was forced to resign as Chancellor the British steel industry was booming partly out of fear of nationalisation! However his replacement the horrid and frankly stalinist Mr. Cripps immideatly nationalised it on principle.
Its not just a case of nationalisation, have Dalton and Bevin's pragmatic interventionism dominate Labour and you'll see a Party more nationalistic and interested in Britain's independence post-Empire. IMO 1945-1979 basically consisted of Labour implmenting reforms and experiments while the Tories were pretty inactive merely curbing excesses as they saw them. So I think a changed Labour Party is the ticket and it may well colour Tory views as well