Thanks for the replies so far, I did some more research on David and it would seem he was on the 225 Entry at RAF Halton - managed to find a website on it.
From what I know David was a RotoTuner (or however you spell it) - my mum recalls that David had been offered a job in civi street which he turned down shortly before the crash.
Managed to find a photo of the memorial on the island too, do they keep them maintained??