@shrinkrap I’d be remiss not to encourage you to eat Indian food in London.
Dishoom is a family favorite. There are (at least) two outposts of restaurants from Mumbai - Trishna, lauded for its seafood, and Farzi Cafe (which may not work for your DH, it’s a modern take… my dad didn’t love it but the rest of us enjoyed the twists). Past favorites include several from the Chutney Mary group (Veeraswamy’s weekend brunch used to be a whole thing). Gunpowder is on my list for another time.
ETA: I forgot one of my favorite takeaway meal places also has branches there - The Kati Roll Company.
On a different note, much better Eastern European food there too, if you want to explore.
(Also Ottolenghi, if that’s of interest / curiosity.)
What a wonderful trip to look forward to!