Campaigners protesting against tax avoidance by big business have taken over Topshop's flagship branch and forced it to close temporarily.
Topshop boss Sir Philip Green has been criticised because his wife, the firm's direct owner, lives in a tax haven.
With a personal fortune of more than £4bn, he owns the Arcadia Group, whose fashion chains include Topshop, Burton, Dorothy Perkins, Evans and Miss Selfridge.
His wife Tina is the direct owner of Arcadia, and she is officially a resident of Monaco.
This enabled her to gain a tax-free £1.2bn dividend in 2005.