Charlotte Church sings outside Shell's London HQ in protest at Arctic drilling

Singer takes part in performance organised by Greenpeace aimed at persuading executives at oil giant to lift lid on plans to drill in Chukchi sea

The trains rumbled overhead, the rain drove in sideways and the buses steered through the crowds. But despite the distractions, Charlotte Church carried on singing the blues song This Bitter Earth.

She was performing metres from the oil giant Shell's headquarters beside the Thames in London, in an effort to persuade company executives to blow the whistle on its Arctic drilling.