On April 12th a sonic boom was heard accross several counties in England. The official explanation for this particular boom is that RAF Typhoon jets from RAF bLAH were scrambled to intercept a helicopter transmitting a mayday signal.
Other websites had more information…
“Earthfiles has received information from an English mother whose adult son with good eyesight watched a silver disc above a small helicopter in the Bath, Somerset, sky at 6:10 PM local time on Thursday evening, April 12. The young man also saw a large Typhoon jet loudly zoom in and slow down into tight rotation around the small helicopter. It is not clear if the silver disc “blinked out” or rapidly moved off”. – Linda Moulton Howe – Earthfiles.com
“The jets kept circling (the sock-shaped UFO). It was very strange.”
- April 12, 2012 eyewitness, Bath, England∗