I love a good Ruby Murray (for the uninitiated, that's cockney rhyming slang for curry....as a generic term for any British variant of an Indian meal).
Too many favourites to list. CTM (chicken tikka masala) is my go-to, and my measuring stick by which I judge any Indian restaurant. Also a big fan of lamb korma, passanda or rogan josh. Oh...and any balti dish, which actually originated in England.
I like saag aloo and saag paneer as side dishes, and you can't beat a good onion bhaji as a starter. I'm a fan of garlic naan but I prefer Peshwari naan, particularly if I'm dialling up the heat of the dish where the sweetness of the naan cuts into the spice 9f the dish.
Other curry options are available.