The 40th Anti-Aircraft Brigade was an air defence formation of Anti-Aircraft Command in the British Territorial Army (TA) formed shortly before the outbreak of the Second World War. Its initial role was to defend Royal Air Force (RAF) airfields in East Anglia. Later it commanded part of the searchlight belt protecting The Midlands. In 1944 the brigade was moved south to protect the embarkation ports for Operation Overlord and to defend against V-1 flying bombs in Operation Diver. It was briefly reformed in the postwar TA.

The 2nd Anti-Aircraft Division was an Air Defence formation of the British Army from 1935 to 1942. It controlled anti-aircraft gun and searchlight units of the Territorial Army (TA) defending the East Midlands and East Anglia during The Blitz.