You will be stung with customs and VAT and a courier handling charge- The mains adapter will be 110 volt, and MIGHT be 100-240 volt (but then US two pronged) and for any warranty claims you MAY have to return to the US.
You then have to find a company that will ship to the UK, and accept a US credit card, and your card company may tmp block the transaction if you dont buy abroad much.
Current exchange rate is likely to make this a non starter.
However, I buy most of my expensive electronics from the US - message me if you want to know how to do it well.
[email protected]...Jon.