I dont know if this has been mentioned before, but if you have access to a business which is VAT registered (owned/work for) and can have goods delivered to the business premises you can buy things VAT free from Pixmania-Pro.co.uk and Sony Style.
I know how people feel about Pixmania, but for me it was a lifesaver just a few months back (nearly, lol) as I was able to buy a larger lcd with the money I saved. They are not cheaper on everything (and seem to have become a little more epxensive since I started buying from them a few years ago.
Something I learned the other day was that Pixmania is actually owned by DSG.
I have also successfully done this with sony style when buying a laptop, and it was relatively painless (I rang them and ordered within 15 mins).
The VAT free is based upon some obscure rule which allows intro community B2B sales to be classed as VAT free.