This last trip, grapefruit marmalade was a revelation.
How often do you go? Lucky you! I love London and have friends there.
There’s a website called British Superstore (I think - google it) where you can order from all the stores. If you really want to go overboard, you can order food and hampers from Fortnum & Masons. Or, if you can’t afford that, you can simply buy a jar of jam or cranberry sauce. Of course, there is a lot of junk sold too; I’m not always crazy about cheap English candy or canned treacle pudding, lol!