I've sent beef jerky and wet wipes to my cousin that was in 3/5 a couple of years ago. I sent some nice toilet paper too, because I remembered what it was like wiping my ass with the wax paper the USMC supplies. I would think that Copenhagen would be highly sought after, but I always liked Redman myself. I'm not too sure the Brits are used to chewing or dipping. Either way, it'd be good to send it because they can trade with it.
If porn is outlawed, and they are Brits....send a Nigella Lawson cookbook.