The Tynemouth Volunteer Artillery claims to be the oldest volunteer artillery unit of the British Army. It served coastal and siege guns in World War I and World War II, and also served in the infantry role.
30th (Surrey) Searchlight Regiment was an air defence unit of Britain's Territorial Army from 1924 until 1961. During World War II it served in The Blitz and later in the Tunisian and Italian Campaigns, while detachments from the regiment served in the Far East and were captured at the Fall of Singapore.
58th (Middlesex) Searchlight Regiment, Royal Artillery was an air defence unit of Britain's Territorial Army (TA) raised just before World War II. It defended the East Midlands of England during The Blitz, and later served as infantry in North West Europe at the end of the war, converting to the anti-aircraft (AA) artillery role postwar.
48th (Hampshire) Searchlight Regiment, Royal Artillery was an air defence unit of Britain's Territorial Army (TA) formed just before the outbreak of World War II from existing searchlight companies of the Royal Engineers. It served in Anti-Aircraft Command until 1944, including the Portsmouth Blitz and Operation Diver. At the end of the war it formed an infantry unit for garrison duties in liberated Europe. It continued in the postwar TA until AA Command was disbanded in 1955.
The 51st (Highland) Searchlight Regiment, Royal Artillery was a Scottish unit of Britain's Territorial Army (TA) formed for air defence just before World War II. It later served as an anti-aircraft (AA) artillery unit in the North West Europe Campaign 1944–45, and continued in the postwar TA into the 1950s.
The 59th (Warwickshire) Searchlight Regiment, Royal Artillery was an air defence unit of the Territorial Army (TA), part of the British Army, and was raised in Birmingham in 1938 just before the Second World War. It later served as a light anti-aircraft gun unit and continued in the postwar TA.
The 71st (Forth) Heavy Anti-Aircraft Regiment, Royal Artillery was an air defence unit of Britain's Territorial Army (TA) formed in Scotland just before World War II. It served in North Africa and Italy during the war. Its' successors continue to serve in the Army Reserve as part of the Royal Logistic Corps.
The Cornwall Fortress Royal Engineers, was a volunteer unit of Britain's Royal Engineers formed in 1908. It helped to defend the coastal towns of Cornwall and sent engineer units to work on the Western Front. Converted to an air defence role before World War I, it served as a searchlight unit during the Battle of Britain, the Blitz, then, as a light anti-aircraft gun unit, it served in the most heavily attacked part of the South Coast of England throughout 1942–44, including the V-1 flying bomb campaign.
The 71st Searchlight Regiment, Royal Artillery was an air defence unit of Britain's Territorial Army (TA), which was raised just before the outbreak of World War II and served as part of Anti-Aircraft Command during and after the war.
42nd Anti-Aircraft Brigade was an air defence formation of Britain's Territorial Army (TA). It was responsible for protecting the City of Glasgow and industry along the Firth of Clyde during the Second World War.
43rd Anti-Aircraft Brigade was an air defence formation of Britain's Territorial Army (TA). Formed in 1938, it was responsible for protecting Teesside in North East England during the early part of the Second World War, and later defended South East England from V-1 flying bombs. It was reformed postwar and survived under different titles until 1961.
The 2nd Devonshire Artillery Volunteers was a unit of the British Volunteer Force and Territorial Army. The unit and its successors defended Plymouth Dockyard and the Devon coast from 1861 to 1961.
The East Riding Royal Garrison Artillery (ERRGA) was a part-time unit of Britain's Royal Artillery based at Hull in the East Riding of Yorkshire. It provided coastal defence artillery along the Humber Estuary from 1908 to 1956, manned siege batteries on the Western Front during World War I at the Somme and Ypres and played a role in the pursuit of the German army during the Hundred Days Offensive. It served as infantry in Allied-occupied Germany after World War II. Its successor units in the Territorial Army included anti-aircraft artillery and field engineers.
3rd Anti-Aircraft Brigade was a Supplementary Reserve air defence formation of the British Army formed in Northern Ireland in 1938. On the outbreak of the Second World War it saw active service with the British Expeditionary Force during the Battle of France and Operation Aerial. It then returned to Northern Ireland and defended the Province for the next two years. Postwar, it was reformed in the Territorial Army and served until the disbandment of Anti-Aircraft Command in 1955.
The Orkney Heavy Regiment was a Territorial Army unit of Britain's Royal Artillery raised in the Orkney Islands just before World War II. During the war it was greatly expanded to defend the vital naval base of Scapa Flow. It was reformed postwar and later became an air defence battery.
The Antrim Fortress Royal Engineers was a coast defence unit of the UK's Territorial Army formed in Northern Ireland in the late 1930s. During World War II it was converted to a parachute role and dropped into Normandy on D Day and across the Rhine during Operation Varsity. Its successors continue in the Army Reserve today.
228th (Edinburgh) Heavy Anti-Aircraft Battery, Royal Artillery was a Scottish air defence unit of Britain's Territorial Army (TA) formed in the City of Edinburgh during the period of international tension leading up to the outbreak of World War II. It defended Eastern Scotland during the early part of the war and then served in the defence of Gibraltar. Its successor unit served in the postwar TA as air defence artillery and as engineers until 1999.
102nd Heavy Anti-Aircraft Regiment, Royal Artillery, was an air defence unit of Britain's Territorial Army (TA) formed at Antrim, Northern Ireland, during the period of international tension leading up to the outbreak of World War II. It defended Belfast and its shipyards during the early part of the war and then served in the Middle East. The regiment continued in the postwar TA until amalgamated in 1955.
The Thames and Medway Coast Artillery, which at its peak comprised three full regiments, was formed in Britain's Territorial Army in 1932 to man coastal defence guns on both banks of the Thames Estuary. It served in this role during World War II, at the end of which it sent troops to work in the rear areas in Europe. It was reformed postwar but was broken up when the coast artillery branch was abolished in 1956.
The 1st Lancashire Artillery Volunteers, popularly known as 'Brown's Corps', was an auxiliary unit of the British Army raised in Liverpool in 1859. As the Lancashire & Cheshire Royal Garrison Artillery in the Territorial Force it was responsible for defending the Mersey Estuary and the coastline of North West England. It was one of the few coast defence units to fire a shot during World War I but also provided personnel for a number of siege batteries that saw action on the Western Front. It continued in the coast defence role during World War II, at the end of which it sent troops to work in the rear areas in Europe. It was reformed postwar but was broken up when the coast artillery branch was abolished in 1956.
United Kingdom 
Territorial Army 