DHL and Fedex collect what they deem are appropriate duty fees for their shipments (and they usually overestimate for their own safety) then add on service fees for doing so, and require payment before or sometimes after delivery. For that amount I would estimate about $60, but that is purely a guess based on a couple of my prior shipments. Ask to have it shipped by Royal Mail or Parcel Force with signature delivery verification, if possible. Takes longer, insurance is not as good, but a much higher likelihood of it getting through customs without getting dinged for duty. also request that they list it on the customs label as "Ethnic Clothing" which is supposed to go through without (much if any) duty. Worth the effort.

The kilt maker prefers to use DHL or Fedex because they can have better tracking and insurance with less likelihood of a lost shipment and potential financial loss for them.