Ten years ago the Boots group generally paid about one-third of its profits in UK tax. The UGG Boots Sale could expect to see a tax charge around the £120-£150m mark each year, with over £100m of that coming from Boots the Chemist.

Then came the move to the low-tax Swiss canton of Zug. Alliance Boots GmbH is now registered at Zug's 94 Baarerstrasse, an address that is UGG Classic Cardy boots to a post office. After huge interest payments, its worldwide profits last year were £475m. It is hard to see which parts of the company are now making what, but the cashflow statement for the year to March 2010 shows that just £14m was recorded as the tax charge on UGG Classic Short boots profits – that is, just 3% of profits. John Ralfe, the former head of corporate finance at Boots, told us he calculated that, "the UK has lost about £100m a year in tax as a result".