The UK is not under any real level of restriction, and the (own-currency) debt taken on is not of a form that would harm growth. Compared to its peers the UK is doing abysmally; the distinguishing factor is Brexit.
I literally can not imagine thinking this is comparable to any other economic event, since the world wars or great depression anyway.
US GDP is around 2.5% below pre-covid trend; the UK is far behind that. UK exporters (and importers) have taken a huge hit from the new trade barriers.