As a teenager, I used to visit London a lot in the early 80s. Then, the only complaints about foreigners taking over were about a few oil-rich Arabs buying everything.
If only that were the case now. It's definitely a case of quantity not quality now. London is another country, where if you have money, you will be able to insulate yourself from a lot of what goes on. Most of the sensible 'Londoners' have emigrated to the south east or elsewhere.
If I never went to London again, it would be too soon.
Re. The Cats. Yes, made the same mistake myself once.
Space Cat = seems like a decent sort
Spacecat = demented