hello there m8
there are a few ways of buying them,
best one is ,buy it from ford dealer in usa then u still have full ford warrenty ,but be aware of the taxes be prepared to pay anything from around 10k upwards tax yup
a good way to look at them is if u see the price in dollars thats what u wil pay in pounds buy the time u pay shipping,taxes,sv test,
other way to save the hastle buy one here plenty of american dealers here ,
if importing watch the port iv heard of them getting robbed,
mine was advertised on ebay, i know i laughed myself ,,so insure it well
hope this helps ,