Regarding the London part, I have a question born out of curiosity and a slight bit of worry, would it be possible to see all that content in a previous save that already reached 99% obesity rate without having to regress the national rate back or would it need to be reverted or create a new game?
I ask cause it would be a bit of a grind to reach the whole thing back in another save again (and I'm kind of attached to the one I already have too lol), maybe if you reach that point it could help you reach back and forth on the rates faster with an upgrade or similar, to help see that content in your save?
Alternatively you could just travel to a new town inside the existing savegame, keeping all the archievements, money, XP and fluffiness rate!
Maybe go to the newly opened hairdressers and swallow some bitter weightloss pills from the pharmacy so the experience feels more then a new start but with all the archievements from the past!
BTW: i'm more interested in lowering the fatty rate again in future updates - which also was already confirmed!