Not just Big Ben.  You can also see the London Eye in that city and another city has the steampunk theme reminiscent of the Industrial Revolution.  Besides, we've had out-of-place legendaries since Gen-V—the Swords of Justice were in New York City instead of France; and the XYZ Trio were in France instead of Scandinavia.

The region is the first one whose name lacks an 'O' in its English name and the name is Galar.

Still continuing the Fire Starter Chinese Zodiac theme with Scorbunny—Gen-I was Dragon, Gen-II was Rat (sort of), Gen-III was Rooster, Gen-IV was Monkey, Gen-V was Pig, Gen-VI was Dog (sort of), Gen-VII was Tiger, and Gen-VIII is Rabbit.  Ox, Snake, Horse and Sheep/Goat are left and they already have Pokémon for them.