Some have reported their homes were shaken by the noise.
Cambridge City Council tweeted: "If you heard a massively loud bang over Cambridge in the last few minutes, don't panic - apparently it was the sonic boom from a fighter plane breaking the sound barrier!"
One Epping Forest councillor posted this video of the boom on Twitter:
Sonic boooooom. Thought it was my parking at first �� pic.twitter.com/S44RFAkiw8— Cllr_Owen (@cllr_owen) January 12, 2021
TV Star Rylan Clark-Neal posted on Twitter after hearing the noise.
Wish I’d checked Twitter before I decided to single handedly , automatic wine opener in hand inspect upstairs thinking a flying burglar had broken into my loft that was bloody loud #sonicboom— Rylan Clark-Neal (@Rylan) January 12, 2021