I was fortunate to have a chat with one of the Concorde Pilots who came onboard to give a lecture.
He solved a mystery for me....growing up in North Devon, Concorde would fly over on her way to Heathrow twice a day.
During the winter we heard sonic booms, during the summer we did not. Complaints to BA were fobbed off saying it was
atmospherics etc.
When asked about this the pilot gave me a grin, looked around and told me that for all the advanced technology flying the
plane was mostly done using basic instrumentation, a calculator and the MK1 eyeball!
During the summer they could clearly see the Southwest peninsula coming up and would throttle back to sub-sonic.
During the winter however they would look for the glow from Bristol as a sign to slow down, being to the West
of Bristol she was still supersonic when she flew over my house!