The latest board shake-up at Aviva is radical, but not as radical as sacking its entire workforce by email. More than 1,300 workers at Aviva Investors, the insurer's asset management arm, were shocked on Friday to receive an exit email from the HR department. There was a stunned silence at the London headquarters as staff across the division read the unsympathetic memo - intended for just one employee. It instructed all Aviva Investor workers to hand over company property and security passes on their way out of the building, and submit all electronic passwords. The terse communication reminded staff not...