Earlier quoted context omitted.
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.
So far as I have heard, the UK went way harder into lockdowns and other measures than the US. And from what I saw, what happened to the US was insane. Everything was closed down for months (or longer depending on the industry.) Supply chains were incredibly disrupted. The government went deeply into debt and inflation is skyrocketting. There are still shortages of many things for the forseeable future. Unprecedented…
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.