Hey now, that’s moving the goalposts. First you said since the war, then the last 60 years, now the last 40. Why not make it the last 20 years and put Labour ahead while you’re at it?
how the UK can have made the Tories the most successful political party and be a nice place to live
In general, governments will only promise what the public will vote for, and they’ll only go as far right/left on any given issue as the electorate will stand. And Parliament has sovereignty, not Government. So whether it’s Labour or Conservative in power, any policies they present will be tempered by a) what they think will get them elected in the first place and b) what they can get through Parliament.
Do I think everything the Conservatives have done has been good for the country? No, obviously not - look at child poverty rates going up since Labour, homelessness rates ditto, productivity still limping along, how we’re currently being an international laughing-stock for making such a hash out of Brexit. But there are limits to what they or any other party can do to totally ruin the country single-handed, luckily.
I am a bit puzzled by your logic, though, which seems to be ‘if you think the country’s a nice place to live then you can’t really criticise the main political parties that have been in power recently’. By that logic Labour’s been mostly in power for the last 20 years, so you must therefore not think they’re wrong?