The technical design of countermeasures was handled by a section under Dr Robert Cockburn at the Telecommunications Research Establishment at Swanage.

[3] 80 Wing worked under the immediate control of the Air Ministry but kept in close touch with the Fighter Command operations room at RAF Bentley Priory.

Scientific intelligence gave about six weeks' warning that these raids would employ X-Gerät with a new supersonic modulation frequency.

80 Wing was able to add supersonic modulation to its jammers but was briefed not to employ this countermeasure until listening stations had confirmed that the Luftwaffe was using the new technique.

Jones estimated that the delay in allowing 80 Wing to begin jamming cost about 400 lives and another 600 serious injuries, while Anti-Aircraft Command was forced to redeploy hundreds of guns to cover potential Baedeker targets.

By the end of the war 100 (BS) Group was based at Bylaugh Hall in Norfolk with 13 operational squadrons flying a variety of aircraft equipped for radio countermeasures and De Havilland Mosquito intruders directly to attack Luftwaffe night fighters.

In 1977 Addison appeared in the BBC television documentary series The Secret War, in episode one; "The Battle of the Beams".