I think you might get some joy if you go to the website.
WWW.230sqn.co.uk
Fill in the Contact Us form and wait. Rob Turner the President was a former Commanding Officer of the Sqn ( I think in the 70's). His son is now an High flying Air Vice Marshall and was a pilot on 230Sqn in the late 1980's, just after the incident in question. 230 Sqn Association was the biggest in the RAF when I served with them.
If they can't help, ask them for the name and address of the current F540 officer on the Squadron at RAF Benson( F540 is the Sqn history form). I think all the F540 history documents are sent to the Imperial War Museum in London.
All the best with your quest.