Boris business adviser to relocate

Was it only last month that Mayor Johnson named the very eminent Sir Martin Sorrell as chair of his International Business Advisory Council? Why, yes it was! And now Sir Martin's company, the giant advertising agency WPP, has announced that it will be relocating its British headquarters to Ireland to avoid the threat of higher corporation tax. Will these headquarters continue to be known as "British"? More importantly, does the mayor think it appropriate to continue taking advice from Sir Martin about cultivating international business in London when Sir Martin's own company is fleeing overseas? Just wondering.