Shipping will be USD 80, so your total is now 1335 or £667
Import duty and VAT will add about £85 (I had similar value parcel from Canada a few weeks ago) and if Parcelforce deliver it (which I imagine they will given the high value) they charge a clearance fee of £13.00
Your now at £765, and thats only a few quid cheaper than the UK price.
That also doesn't take into account the possibilities of it getting lost in the mail, damaged on the way over, or developing a fault and the cost of returning it to the US.