I don't know how they came up with their numbers but media outlets seem to be confident quoting their figures. Also I found this written by a Tory who was an MP and is now in the House of Lords:

The latest estimates are that Brexit reduced GDP by 6 to 8 per cent by 2025, with business investment down 12 to 18 per cent.

If I were to see news articles saying that Brexit is having a fantastically positive effect on the British economy then maybe I'll look at Brexit as being somewhat beneficial. But I haven't seen that. Also like I said, I think having close ties with Europe can have some benefits beyond just easing international trade. It means Europe together can stand up against big countries who dislike Europe and want to harm Europe.

Maybe we won't agree though. I guess you think Brexit is going to be a good thing for the UK in the long-term? I guess I'm not so convinced about that.

You see, that's the problem. Many people voted for Brexit. Left and right. I know if those from the right that cannot stand Reform. You cannot say Norway is racist for not being part of the EU. We have always been arms length, hence why we kept the pound. The public never signed up to the EU fully. It was voted for, decided and any democrat would accept it's a constraint the country needs to work within. The whole wait 5 years, ignore it and rejoin later just drives folk to Reform, angry that they aren't being listened to.

You don't fight fascism by ignoring democracy. You normalise it. And yes, I voted remain, but arrogantly thinking you're right and folk are dumb or evil, serves your ego rather than decent principles like democracy which is the cornerstone of our society.

I do agree we shouldn't pander though and these punish migrant policies Labour are pushing is normalising this. With their people snooping policies, its fascism lite. An introduction.