Lost jobs and lost trades taxes in the UK.
I'm sorry but this is an example of the utter b***ocks that we've had to deal with in relation to Brexit. Look at the state of the sources in that screenshot. I've already dealt with "The Lord Mayor of London says...."
But the thing I really feel the need to jump on is this "We've calculated how much poorer the UK us because of Brexit."
So in the thing you've posted it says "the city of London has so many fewer jobs than if Brexit hadn't happened". So everyone reads it and goes "oh sh**, Brexit has really been bad". It's a lie though. The City of London has more jobs than when Brexit happened. Even the Lord Mayor of London says so in his analysis.
So what these analyses are doing is making a prediction about how things would have looked if Brexit hadn't happened and then comparing them to now. They then present this as some kind of factual analysis when it is actually something that has been plucked out of their a**.
A lot of these analyses use, for example, UK economic performance projections carried out by the OECD and World Bank before the Brexit referendum in 2016. So some of these organisations will have done a 10 year view of the UK in, say, 2015, and we are below some of these projections.
What these people don't do, however, is look at where the UK is currently, compared to where all of our peers are currently and look at how those projections fared with other countries.
The truth is that the global economy is well down on where analysts in 2015 saw it. Covid, the deterioration in the global geopolitical situation, political instability in many major economies, all of these have had a huge impact.
I don't actually know if we are poorer because of Brexit. Nobody does. If they tell you that they can say for sure what the economic impact of Brexit has been with any confidence, they're a total mug, that is not worth listening to.
I can tell you this though: our GDP and growth has been in line with previous trajectories/trends and in line with peers. And certainly there has been no obvious negative or positive impact on metrics such as employment, house prices, average wage, because of Brexit (so far). Things have generally continued upwards at a rate consistent with the previous 20 - 30 years and we are about where we were in relation ro peers such as Germany, France etc, so unless it was the case that had we stayed in the EU we'd have shot up above the pack and started to significant increase our upwards trajectory in terms of growth, employment, wage rises etc, I think the surprising thing about Brexit is how little obvious measurable impact it has had (so far).