It was actually a Kelty Clark (£70!) from REI Outlet, shipped via USPS, which I generally prefer on the grounds of cost and reliability.
Interestingly, I've been done AGAIN today (twice) for some shoes and a dress a couple of friends sent over marked as gifts. The (newish) rules are no duty/VAT on items under £18 net value, or under £36 for gifts, and duty reduced to 3.5% (no VAT reduction) on gifts over £36. I wonder if I have just been unlucky, or whether they're starting to clamp down more.