It wont be the UK that collapses first, it will be China/Japan/Italy. The UK will collapse with a collapse of the Eurozone as a whole.
Russia had a chance to weather this storm as their national debt was relatively low, but with the invasion no one will need to buy their resources (and thus wont) if we roll into a full winter scenario.
There will be global food shortages and not a damn thing can’t be done about it in the near-term. Central Banks and their puppet governments can print their way out of financial crises, at least temporarily, but you can’t print your way out of food and energy shortages.