Just ordered them. I got an email saying they've actually put a £50 value on the parcel - something they say they won't do in the listing. Hopefully this will mean no import duty. Also sent by dhl, should have them by the end of the week, just in time for my birthday
Looks like they've just put the value of one unit on the parcel so probably half the duty expected if they do ping you!
You're going to have a very happy birthday I think
