Be sure you wear your MAGA hat at all times...
I was in London the weekend after the election in 2016, wore my MAGA hat everywhere. No one really noticed. Great town. Ignore the Eeyores on this forum. Yes, UK has a lot of serious problems, but London is still an amazing city. I highly recommend Mamies in Covent Garden - relatively cheap place to eat, as of last summer was #1 restaurant in London by Tripadvisor.
Catch a band at the historic 100 Club on Oxford Street. Step in to St. Martin in the Fields, just off Trafalgar Square. One of the most beautiful churches I have ever seen. Many museums are free like in DC.
During the week (not on Sunday), stop in at St. Mary Woolnoth church in the financial district where John Newton is buried.
If you have time, the bike tours are a great way to see the city.