A nuisance neighbour who blamed the death of his son on police will be sentenced next month under the Mental Health Act, after breaching three anti-social behaviour orders (Asbos).

Roger Gloucester-Trotman, 74, of Glen Avenue, Purley, breached Asbos taken out to protect three different people he had harrassed near his former home in Devon Road, Cheam, and Westmead Road, where his accountancy firm was based.

Gloucester-Trotman, a controversial figure with a history of neighbourhood disputes, claimed his mental state had deteriorated because he had failed to cope with the death of his son, property developer Ian Trotman.

Mr Trotman killed himself in Cowper Avenue in May 2010 after gassing himself in a manhole while embroiled in a legal dispute with his former partner.

The 41-year-old sealed himself inside the drain near his workshop, close to his father’s accountancy practice. He was found inside with an angle-grinder, a petrol can and towels.

Gloucester-Trotman was due to be sentenced at Croydon Crown Court on Friday, but the sentencing was adjourned for probation to find the pensioner a suitable treatment programme.

The 73-year-old consented to treatment, telling the court: “I have been traumatised by the death of my son [which was] caused by the police.”

Gloucester-Trotman believes the police failed to properly investigate allegations made about his son’s former partner in the run-up to Mr Trotman’s death.

He told the court he had six separate complaints to the Independent Police Complaints Commission (IPCC) currently being investigated.

The 73-year-old, who was fined £1,000 and excluded from membership from the Institute of Chartered Accountants in England and Wales last year after another Asbo breach, will be sentenced on June 27.