Well I thought it would be a good idea to complaint about VOSA's (in)actions with the Parliamentary and Health Services Ombudsperson...but it would be useful if they actually investigated the case.

I received a response saying that having assessed the complaint I made, they see that VOSA has performed within their remit and do not feel any malpractice or maladministration has occurred. 

So have made a complaint with the Chief Ombudsperson about that statement - cos it clearly was a maladministration - in the fact that the PHSO original statement that the cause of the bonnet catch failure was due to "lack of the required maintenance or the bonnet was not closed correctly".  The latter is a matter of your word against mine, but the former is interesting, cos the catch didn't require maintenance - so how could that be a root-cause at the time of my incident?  Strange, hey?

Well we will see what the Chief Ombudsperson has to say!