The son of a retired property developer who killed his wife and then himself has criticised an under-fire NHS trust for not learning from mistakes in mental health care.

Joe Goswell, whose parents Roger Goswell, 66, and Susan Goswell, 63, died nearly nine years ago, said the manslaughter conviction this week of Matthew Daley for killing Donald Lock, 79, revived painful memories.

He said the Daley case proved Sussex Partnership NHS Foundation Trust had failed to learn lessons following his parents' deaths, despite recommendations made in the aftermath.

The trust's chief executive Colm Donaghy admitted this week, following the conclusion of Daley's two-week trial at Lewes Crown Court, that it had "got things wrong" in his case.

It announced an independent review of 10 killings involving patients known to the trust, including the cases of the Goswells and that of paranoid schizophrenic Daley.

Mr Goswell said he only learned of the review through the media: "It's bloody typical of the NHS. They can't even get it sorted to let us know. I'm disgusted with the whole situation."

He said the case of Daley, 35, who stabbed retired solicitor Mr Lock 39 times following a minor shunt on the A24 in Findon, West Sussex, had left him in tears through the memories it brought back.

Mr Goswell's mentally unwell father fatally stabbed his mother and clubbed her with a rubber-headed mallet at their gated bungalow in West Sussex on December 23 2007.

A four-day inquest in 2008 heard of a series of shortfalls by medical professionals and police in the weeks leading up to the couple's deaths. The family said after the inquest that the deaths were "predictable and avoidable".

Of the Daley case, Mr Goswell said: "I was crying this morning and crying yesterday, it has brought it all back. Our case has destroyed our family. My mother held the whole family together.

"Christmas is no good at all, even with young children. I have lost it as far as Christmas is concerned. It has destroyed us all as children."

Mr Goswell said that in his parents' case the NHS failed to share vital information and did not listen to the family about their concerns for his father.

"We would have hoped that they would have learned from their mistakes, but clearly they haven't," said Mr Goswell.

"We sometimes feel that, as children, could we have done something else to have helped our mother and father, but we were in the hands of doctors and medical professionals.

"We felt at the time that they knew best, and that wasn't the case with us. It's very, very sad, not only at the tragic loss of my father and mother but also for Mr Lock."

The trust said in a statement that the review will look at whether there are any "common themes" relating to its services. It apologised to those families made aware of the review before being officially told.

It said: "The purpose of the review that we have commissioned with NHS England is to seek independent assurance that we've done everything we should have in relation to these incidents.

"We don't want to pre-judge the outcome of this review by commenting in detail on specific cases at this time.

"It was always our intention to contact families. We wanted to avoid media speculation of which cases would be covered in this review which is why we have been open about the details.

"However, we appreciate that in some cases relatives would have read about this before receiving official notification. We apologise if this has caused distress."