Borough Market and some of the pop up food markets in London are worth visit.
I'm a big fan of the Science and War museums, and also a Tate Modern go-er. Museum of London can be good - and then look for graffiti tours / alternative walking tours/ etc
Is there anything left to do with the Navy in Greenwich these days? I guess the Cutty Sark is still there - but anything else?
Don't bother with Camden Market - it has become all Disney-fied.
I am guessing that Mrs Potter and the Potterettes may have have enough Indian food for a life time - so hit a pie n mash shop - Manze's in Bermondsey just next to Tower Bridge.
Flesh n Buns is also good and interesting -
https://www.fleshandbuns.com
or if you want propah English - go to Rules
https://rules.co.uk