Hi malthousemouse if you have written to official sources and can document that you did so AND that you had no reply, it sounds like the next port of call is the MP. If they do not respond, it's the dear old media. Start with the local paper and see if they will raise a stink.
Above all else, DOCUMENT with photographs, dates and times that it happens. If you don't have the evidence, no one will listen to you. Best of luck.
(on the more general theme) My uncle was killed in the early 50s when the conversion to jets was still being learnt. he was an instructor but his student killed them both on approach to RAF Stradishall in Cambridgeshire.