My DH said defo no baby wipes, they got millions sent by charities and no-one wanted them.
I sent things like Reggae Ragge sauce, Daves Insanity sauce, HP, onion chutney, any type of sauce/relisht hey could use to perk the food up basically, as they were on rations only for a long time. Pringles, other crisps, popcorn, flapjacks, biscuits, cereal bars, sweets like Haribo, laces etc. Mints, lemon sherbets, all that sort of stuff.
I also sent diet coke as they really struggled ot get it where they were, also bottles of diluting squash.
I did send things like the olives you get in little packets, parmesan cheese, whole salamis/chorizos, tins of crab/lobster, packets of decent (ish!) tuna steaks. Also part baked bread, tins of pate etc. All these things might be a bit odd to send to someone other than your DH though, as they could be classed as odd things to send. All lasted perfectly well though, but I didn't send them around Christmas time.
DVD's go down quite well too, things like the Monty Python films, stand up, comedy series box sets etc.