Sir Martin Sorrell reveals cancer treatment

S4 Capital boss says it's almost business as usual' after keyhole surgery to remove tumour

Sir Martin Sorrell has revealed that he had keyhole surgery to remove a tumour in February, and will undergo further preventive cancer treatment.

The veteran advertising boss, who is executive chair of the digital-led ad group S4 Capital, said he is back almost to business as usual" after successful keyhole surgery", and will continue working, in a statement to the stock market on Monday.