In early November intelligence pointed to a major operation being planned by the Luftwaffe against the Midlands (Coventry Blitz Operation Moonlight Sonata/Unternehmen Mondscheinsonate). The operation orders to the X-Gerät stations on 14 November were intercepted but could not be deciphered by Bletchley Park in time, although 80 Wing's aircraft detected the X-Gerät radio frequencies. Addison telephoned the Air Staff's scientific intelligence adviser, Dr R.V.
In early November, intelligence revealed a major Luftwaffe operation against the Midlands (Coventry Blitz Operation Moonlight Sonata/Unternehmen Mondscheinsonate) was underway. Orders for the X-Gerät stations were intercepted on 14 November but Bletchley Park failed to decipher them in time. However, 80 Wing's aircraft detected the X-Gerät radio frequencies. Addison contacted Dr R.V., the Air Staff's scientific intelligence advisor.