import duty can run as high as 30%, insured for Â£400, you'd be looking around Â£200 & more thru fed-ex etc to deliver it (duty would be of the combined value including shipping). Ideally either have friends in the US & get it sent to them, then either collect it yourself later, or whenever they come over. or stick a waay lower insurance value on it & send it USPS insured surface mail, which is pretty much the cheapest way of sending an item from the US. obviously if it gets lost or trashed in postage, then you wont get the full value.
As far as replacement MC1s & forks go, check Jezs other thread, they're making mental Â£ a.t.m. I sold a mate forks for Â£84 & the MC1 for a pathetic Â£22, but then it was 135mm & only 19in wide! Given this klein in question using conventional forks, its also got a headset reducer, which means new klein headset bearings, if you can find them, they run to around Â£20...& then you'll need the replacement rubber sleeves to sit atop the bearings.
WTD- Shimano M980 XTR Rear Derailleur