Put it in a box, with some Dry Ice to keep it cold, and Fed Ex will ship it anywhere. However, I think there may be a small problem with the Royal Customs House, and the importing of foreign baked goods...
It seems governments don't like the importation of things like processed sweets (foreign made candy is expensive in the US - about double the US price), and there are problems with importing fruit and vegetables. Still, your pie may get there, you just may have to pay more in duties than if you went down to the local bakery and bought one there.
However, this Pi, I can ship electronically to you...
Pi = 3.14159265358979323846264338327950288419716939937
There might be an encryption routine that goes by the name of boysenberry, or loganberry, or what not... but all I could find is plain ol' Pi...