The arrest came about just five days after control of the investigation switched to Scotland Yard's Homicide and Serious Crime Command unit from the local "Sapphire" policing team, which specialises in sexual assault and rape investigations.

BBC: Blunders kept sex attacker free

The force's G Division, which includes the Force Major Investigation Team and the Serious and Organised Crime Unit, will be reviewed with a view to cutting costs.

BBC: Lancashire Police plans to cut further ?20m from budget

The Serious Fraud Office (SFO) acquired the nickname of the Serious Flawed Office in its early years of operation as a unit fighting big financial crime in the 1990s.

BBC: SFO: Can it survive Tchenguiz humiliation?