I lived and worked there for years e.g. when I taught at King’s College London, so I’m used to some parts of London but not all. I liked the historical sites so went there the most.
I went to the UK to visit family and friends (mostly in Wales), and the first thing I managed to do was visit the Tower of London. I still have my £5.50 ticket from 2000. I can only imagine what it costs now. That city is so FULL. A friend who has lived in Putney forever still hasn't seen half.