The general performance of the UK economy has more or less been in line with France/Italy and ahead of Germany but well behind the United States. i.e. fairly middling - and where it's been since 2008.
There's undoubtedly been sectors that have been impacted but most of the UK economy is service oriented so circumvented the bulk of the damage in aggregate.
Composition of trade in the UK and the rest of the G7
Within UK trade, there has been a significant and growing divergence between the performance of goods and services since the pandemic (Chart G).
Growth in UK goods trade (exports plus imports) has fallen well behind the rest of the G7. At the end of 2023, UK goods trade was around 10 per cent below 2019 levels, while it was around 5 higher on average for the rest of the G7 in the third quarter.
Meanwhile, UK services trade growth has been the strongest in the G7. It reached around 12 per cent above 2019 levels at the end of 2023, versus around 9 per cent above in the rest of the G7 in the third quarter.
In the long term, the trends are about the same as well: https://www.thetimes.com/uk/article/uk-economy-will-grow-more-quickly-than-france-in-coming-years-dbr8ltfch
However, the wider point is that this level of growth was achievable within the EU as well and would have saved unnecessary hardship to individuals and saved political capital for real issues.
I don't particularly see how being out of the EU changes this growth trajectory as all major European players are facing the same headwinds. I also think Jazz's point on 'free trade' - a euphemism at the best of times - is wildly optimistic when the the world is increasing protectionist.
I dare say more than economic, the political damage is more significant - the UK is now far less integrated with its neighbours or with their primarily ally, the US at a time when the world is changing rapidly.