Bosses at computer giant Hewlett-Packard took a £5.5bn hit after accusing former staff at a Cambridge software company it bought last year of misleading investors.
HP bought Autonomy in a £7.1 billion deal that saw its founder Dr Mike Lynch pocket around £500 million.
The American firm alleges that former members of Autonomy's management fiddled accounts in a bid to "mislead investors and potential buyers" and has referred the matter to the Serious Fraud Office (SFO).
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After a sunny start, cloud will tend to increase from the northwest during the day, but it will stay dry.
Heavy rain in places which will clear away to the east by late evening.
John Willis was born without fully formed arms and legs but set himself the task of participating in all 34 Olympic and Paralympic sports.