My oldest brother does a lot of business travel and has been to the UK, most recently a year ago and according to him anyone would be nuts to visit there right now.
Go to You Tube and look at all these Brits who are ‘’moving’’ to the US.
What they’re doing is getting out while they can.
Soon there'll be an exit visa on the Brits leaving the UK.
I would disagree with your brother in my opinion - it depends on where you go of course.
As a tourist, I would strongly suggest following the British Heritage tour sites and, while you ought to keep 3 to 4 days for London, don’t linger too much, but spend time in the museums (I can never get enough of the British war museum or the Imperial war museum) and the older parts of Westminster and the city.
Living there - well, that’s another question. I wouldn’t as it is too liberal for me.