In that case it looks like there may not be much point in getting things for anyone. If you order with foothills, the price will be less since you can order it without 20% tax, which mostly covers the cost of shipping to the US with them.
It's pretty hilarious that it would only cost 80 pence more for me to order a t-shirt to be delivered to me in the US than it would be to order one to be delivered to me while I am here in the UK. it's also interesting that actually, either way you do it, the money still ends in government hands. They either get £5.60 from tax, or they get £6.40 through royal mail, which is government owned. hehe