I used the tool to calculate the costs once that upc offers on their site.
It came out to be around 300.-350.- Usd. (to the Netherlands).
i guess if you put some time in it you would find something a bit cheaper,
but I think it could wel be, you end up paying more than the bike or frame is actually worth.
Its just how much you want it.
I came across some classic american bikes a few time overhere,
seems cheaper that way, i think a little patience/ good research and you might find it in the UK.