It's nice to know there are non-EU countries that do that well.
Lets see.
The US, China, Russia, Canada and India all have vast amounts of natural resources they can use to trade. The UK?
The South American nations (those not on the verge of bankruptcy) tow the line of the US without any influence on those decisions and have no real way to protect themselves from policies like Trump is influencing now.
Most of Africa is not doing that well, so we can ignore those.
The middle east sits on lots of oil and / or lives off US subsidies.
South east Asia is in a similar situation as the South american countries but follows China's wishes.
The central Asian republics (those that have a real economy at all) follow either Russia or India.
The Central European countries joined the EU to be able to get out of Russia's sphere of influence and now can actually influence the decisions in the EU.
That leaves a few small European nations, who, as has been pointed out repeatedly, still have to follow EU regulations if they want to trade, but have no actual influence on the actual regulations.
Now lets look at the UK. It's economy is nowhere near strong enough to compete with the major powers or the EU, so it will always negotiate from the weaker position.
The vast majority of it's trade and economy is tied to the EU so if it wants that to continue then it will have to abide by those rules.
The Brexit hope of Trump by now should be gone as it is clear that Trump has no intention to favour the UK in any way whatsoever.
But maybe I have missed something, what medium level economy of a relatively smallish country without abundant natural resources and in a strategically unimportant position is capable of dictating terms to economically more powerful blocs?