The OC of what was ADAC now DLTS something or other has a file on the beasty with history the other option is SLOPS at N'Wood or is he/she now SO2/3/J4/5 now. They used to be the deciders a while back or if you can get one of the old codgers out the home such as Four Bellies he knows just may not remember too well
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Charlie sends
Ps Plessey used to make sonobuoys amongst other things.