Planemike
I did take the 108 operations into account but pilots of that day say no to a boom in the St Athan area because fuel was very limited and the Hatfield 108s did not stray far from home. Winkle of course flew one from Farnborough but that was quite a while after glosgirl says her Dad left St Athan. After Taffy's first bang (which made the press and and was a big mystery so far as the public were concerned) the Farnborough tps were severely restricted to over water ops heading 180 from St Catherine's Head on the IoW - as indeed were similar Dunsfold based ops during 1951/2. Indeed that restriction was still in force a few years later in my time but for different reasons as the security side of exceeding Mach 1 was long gone as an issue following Farnborough 1952.