The patient experience survey[1] is not for serious events like your father's.
There are other methods used to capture that kind of information. The Hospital Event Statistics[2] database is one method.
I fully accept (I've already said in this thread) that the NHS complaints procedure is sub-optimal. Often people say that complaining is as traumatic as the event. People seem to understand that mistakes happen, but when clinicians appear to lie about those events most people are (rightly) hurt and outraged. I've seen a lot of improvement in the complaints handling of one trust in one county; I have no knowledge about other complaints departments. (But I suspect they're pretty bad.)
There are organisations like PALS which should be feeding information back to the trust, even if you're not making a complaint. They should also be helping you with the procedure of making a complaint if that's what you want to do.
LINks don't talk about individual events, but should listen to people talking about general experiences.
I'm not sure what can be done about the process of recording patient and relative experience after serious awful events. I welcome any suggestions.
Afterwards, he didn't fill out a patient survey.