"Europol" - sure, OK. But international police does still cooperate, don't they? Why is Europol so important, if you are not in Europe? Presumably it is about catching EU criminals?

Also I don't claim EU only has negative aspects. But it also doesn't just have positive aspects.

"What we are seeing is the erosion of one of, if not the most open, comprehensive trading blocs ever devised."

Is it, though? After all, there seem to be an awful lot of regulations on what you are allowed to trade and on what terms. It is not simple a free market once you join the EU. Otherwise, why would the contracts be so complicated?

"So take it as read that on a structural level trade and immigration cannot be as simple as they were on reciprocal EU terms. The EU will not allow it."

Again, I don't find that to be a good argument for the EU. They want to be the paragons of freedom in the Western world. If they then treat other countries like you suggest they will, it doesn't look very credible.

And maybe there IS something to be said for pride. Maybe you don't have to take every too good to be true trade offer, if in exchange you are being humiliated.

"So it's getting harder to trade with the UK or migrate here"

With respect to migration, that seems to be the point of Brexit :-)

Still, again, those things happened before the EU. The UK is also still in Europe. Personally, as a German, I don't feel British people are any less European, EU or not.

"In a world where skilled migrants can work anywhere, why would they be going to the country which just opted to make it harder to do business?"

Some things may be harder, some things easier, though. Again, the regulations - just think of Upload Filters and GDPR, for example.

What's wrong with choice? EU will end up being a mono-culture, take it or leave it. I find it a rather creepy outlook, especially with Socialism gaining popularity again.

I think many people will come to the UK for the same reasons they always did. They already know the language or want to learn it, and they like the culture.

"Which has seen its currency collapse since the minutes after the vote in 2016?"

I don't know - if currency is high, economic comment will be "it is bad for our export business", if currency is low they will cry "we are losing our buying power". It's hard to tell what is true. I also remember when the Euro was introduced in Germany - felt like buying power was halved over night. Many price tags remained the same, but one Euro cost 2 DM...

"We will lose the fight for major investment outside of the financial services sector to European nation states. "

It doesn't seem inevitable to me. In fact many small countries seem to make a living from offering favorable deals to finance businesses, that the big behemoths somehow can't offer. So it seems possible that the UK could maintain an edge over EU finance businesses.

And finance - aren't people trading all over the world? Again, why would the UK be barred from doing financial business with the EU?

"We are making it harder to migrate to and from the European Union."

Might have upsides and downsides. I can not simply migrate to the US even though I am an European citizen. Nevertheless the US economy seems to be going strong.