It wont collapse, demand will fall away which naturally pulls inflation with it, life will be hard for certain people for a while. The housing market may well finally correct itself but the sky wont fall in.
But will it?
Prices for energy in particular aren't due to putin.
If energy is getting more and more expensive it's a direct removal of cash from our economy.
More and more people spending less.
And in the UK we have so many accumulating failures. Failures that need more money.
NHS, infrastructure, welfare, pensions etc.
If tax revenues dwindle that cash will either dry up and UK will just rot away or you'll have to tax a population where more and more are struggling.
Even if the war ended tomorrow it might significantly reduce our problems. But we were heading this way anyway. And we have climate change coming. Can't be long before the west starts to be affected by that significantly