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Tax avoidance campaigners have held protests at Starbucks cafes across the UK, despite the firm's pledge to pay millions of pounds of extra corporation tax for the next two years.

UK Uncut says the coffee firm's promise to pay £20m is "a desperate attempt to deflect public pressure" from itself.

It said the action was to highlight its call on the government to better target avoidance so cuts could be avoided.

Starbucks said a "small handful of stores" were closed for a short period.

"There have been no significant incidents. We are back open as usual for our customers, on what is one of the busiest shopping days of the year," a spokeswoman said in a statement to 91�ȱ� News.

UK Uncut says the government should be clamping down on tax avoidance by Starbucks and other companies rather than making cuts to the welfare state.

Organisers said they wanted to show the impact of government cuts on women, and to highlight this set out to transform Starbucks stores into "refuges, creches and homeless shelters".

Rosie Rogers from UK Uncut told 91�ȱ� News "We're absolutely delighted with the events... Hundreds of people turned out on a cold Saturday morning to exercise their right to protest."

Ms Rogers said there were no immediate plans to hold any similar demonstrations but they would continue to boycott Starbucks.

UK Uncut said it had heard from protesters gathering at 10 outlets in London, Birmingham, Oxford and Nottingham.

But employees from two Starbucks cafes in Birmingham who spoke to the 91�ȱ� said just one person had turned up to hand out leaflets but had been asked to leave.

On Thursday, Starbucks revealed it would pay "a significant amount of tax during 2013 and 2014 regardless of whether the company is profitable during these years".

In a statement issued ahead of the protests, a Starbucks spokesperson said it had offered to meet with UK Uncut to discuss their concerns.

It added the company had "listened to our customers" and was "making a number of changes in our business to ensure we pay corporation tax in the UK" - something it urged UK Uncut and other concerned parties to "carefully consider".

Starbucks has paid £8.6m in corporation tax in its 14 years of trading in the UK, and nothing in the last three years. The company had UK sales of nearly £400m in 2011 but has reported a taxable profit only once in its 15 years of operating in the UK.

Starbucks now says it expects to pay around £10m in corporation tax for each of the next two years, a move described by tax experts as unprecedented.

Speaking to 91�ȱ� Radio 4's Today programme, Exchequer Secretary to the Treasury David Gauke said: "If a taxpayer wants to pay more than is required under the law then that is really a matter for them. It's a voluntary donation really rather than tax."

Other global firms such as Amazon and Google have also come under fire for avoiding paying tax on British profits.