Boris Johnson has condemned "sneering" at Starbucks after the firm volunteered to pay millions of pounds more tax.
The London Mayor defended companies like the coffee chain who had been minimising their bills to the Exchequer, insisting they had a duty to shareholders.
Speaking on Sky News's Murnaghan programme, Mr Johnson admitted that Starbucks had got into a "hell of a mess".
But he said:
Imagine that you are the corporate finance director of one of these companies.
Your job is to look at the law as it stands. Your fiduciary duty to your shareholders is to minimise your tax exposure.
It is not to say, 'this looks pretty bad, we had better write a huge cheque to the Government ex-gratia and show that we are good citizens'.
Companies do not work like that.
Now that Starbucks has stepped up to the plate and announced they are going to be making this payment I think rather than everybody sneering at them people should welcome that.
My point is it is a bit unfair to bash the companies and then sneer at them when they try to do good.
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The heavy showers will ease off this weekend.
Labour MPs are attempting to build a consensus for a single challenger to Corbyn, while the big game in the Tory Party is Stop Boris.
Hefty showers and longer, slow moving downpours into this evening and again on Saturday - some lively with thunder.