Pollock storms into London and Banksy dials up the dissent – the week in art

Joe Tilson invades Venice, Helsinki unveils a subterranean culture hub and the prestige art scene finds no takers for Nigel Farage – all in our weekly dispatch

I Object
Subversive art from Gillray to Banksy, ancient Egyptian obscenity to a suffragette song, dug up in the British Museum by Private Eye editor Ian Hislop.
• British Museum, London, 6 September to 20 January

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