Many thanks for all the info and pointers so far.
I have established that the Tornado crash occured on 6th July 1984 near Munich, Germany. A West German Tornado crashed after flying close to a powerful VOA transmitter.
I also recall that a while after the BOI the Tornado fleets were required to avoid certain transmitters by certain distances in order to avoid the effects of electromagnetic transmissions.
In addition the RAF fleet was banned from transmitting on HF or being in close proximity to the tanker when it was transmitting an HF position report. Again I believe the problem was the effect this radiation could have on the flight control systems. I also recall the uncommanded jettison of wing or pylon stores on several occaisions but they may have been more to do with the stores management system software rather than any electromagnetic interference?
Were the standards of electromagnetic protection poor or was this such a new field that standards of testing hadn't yet been fully developed?
Gratefull for any opinion or more pointers!