Amazon UK had sales of £2.91 billion in 2011

"Amazon's UK net sales were £2.91bn in 2011, according to information the retailer has been required to file with the House of Commons Public Accounts Committee (PAC).
The company's director of EU Public Policy, Andrew Cecil, was asked to turn in extra information to the PAC after failing to provide answers to MPs' queries about the structure of the company and its UK sales and profit at an enquiry earlier in the month.
The PAC has released a document on its website of extra written evidence given by Cecil, in which he states: "Although we have not publicly disclosed net sales generated from specific websites targeting EU countries or elsewhere, in response to the committee request, we would like to share with you on a confidential basis net sales generated
from the Amazon.co.uk website over the past three years."
The table shows that in 2011, Amazon¹s UK website generated £2.91bn in sales, paying £416m in UK VAT. Those sales were an increase of 23.3% from 2010, where it made £2.36bn in revenue, paying £262m in VAT. In 2009, Amazon made £1.87bn in sales and paid £172m in VAT.
This contrasts with the published accounts for the UK-established Amazon.co.uk which in 2011 had revenues of £207m, which it derived from providing services in the UK for Amazon Europe companies, with an after tax profit of £1.2m and a tax expense of £1.8m."

Source:  The Bookseller, 26th November 2012