I think the import laws in the UK are a little more liberal than they are over here. My gf's family is from Newcastle, and her uncle is a "senior" customs officer over there. I asked him about this last time I was over, and he didn't think they (the UK) would seize things coming into
the country, but he said that it depends on the country's import laws if I was to ship out
of the UK. I asked specifically about airsoft because I thought he might be able to help me get airsoft items into Canada. (He couldn't, incidentally.)
You probably won't have any trouble getting it into
the UK... but I hope the other guy's paying the shipping.