A woman who sent hundreds of texts, letter and e-mails to bank bosses in a 19-year hate campaign has been detained indefinitely in a secure hospital.

Ruby Cooper, 52, sent threatening messages to RBS chairman Sir Philip Hampton warning him "not to go home this weekend" unless he sent her a cheque for £750,000.

She also harassed RBS's chief executive officer Ross McEwan and told his staff an employee was going to be stabbed if she did not get her money.

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Cooper told psychologists she had been scammed on her mortgage, and also said she had been harassed by a member of NatWest's call centre staff in 1993.

She had been found guilty of breaking a restraining order and at Snaresbrook Crown Court, judge Martyn Zeidman, QC, made an order detaining Cooper, of London.