There was also a bit of a fuss in the late 1970s when some odd winter conditions formed atmospheric conduits that propagated oceanic booms back to the northern UK, rattling windows and causing Letters To Be Written. RAE was involved in the analysis and I believe the result was slight changes to both BA and AF tracks, but I don't think London was in the affected zone.
Incidentally, Lebanon was subject to overflight 'boomage' on the easterly services until the early 1980s at which point HMG also gave-up asking the Indian government for supersonic overflight permission. Edit: to satisfy myself that I wasn't making stuff up, I found this page in a search which also mentions that supersonic flight was also permitted 'over the Nile to the south of Cairo'.
https://books.google.co.uk/books?id=...A136#v=onepage