A few years back I sent tins to Canada (from the US) that I sold on eBay. They always had me mark them as “gift” and declare a low value of about $5-10 on the customs forms so they didn’t get whacked with whatever taxes. It was always small amounts, just a few tins so I don’t think it really attracted much attention. Would the same rules apply to the UK if you had some tins sent from the US?