The last two wartime frontline Avenger squadrons, 820 & 828, retained Avengers until they returned home on their parent carriers, Indefatigable & Implacable, in March & June 1946 respectively.
Beyond that the RN retained about 21 of the then latest TBM-3E aircraft that had been delivered in July 1945. These were used for trials purposes postwar. One user was 703 squadron, the naval flight of the RAF Air-Sea Warfare Development Unit (NASWDU). Some were used for steam catapult trials on Perseus in 1950/51. They were a diminishing asset, but the last one was not struck off charge until Sept 1955.
Then in 1953, due to delays in the delivery of Fairey Gannets for ASW work, the US delivered 100 TBM-3E under MDAP to replace the remaining ASW Barracudas and Fireflies in front line units. These arrived in the UK between March & May 1953 on the Perseus. The first of these went, unmodified, to 703, 815 & 824 squadrons until the end of the year. These aircraft and the other deliveries were modified to British standards at Scottish Aviation Limited at Prestwick becoming AS.4 & AS.5 aircraft and entering service in 1954. These went on to serve with 700, 703, 744, 745, 751, 767 814, 815, 820, 824 until Gannets began to arrive in 1955, when some were passed to the RNVR squadrons, 1830, 1841 & 1844 squadrons until they disbanded in March 1957 as part of the defence cuts of that year.
Some were then converted to ECM.6 models for use by 751 & 831 squadrons until 1960 by which time ECM variants of the Gannet had begun to become available.
The bulk of the AS.4 & AS.5 aircraft were transferred to France and the Netherlands in 1957/58.
It was the AN/APS-20 radar sets from the Skyraider AEW.1 (ex USN AD-4W some of which had been refurbished) that were upgraded and installed in the Gannet AEW.3 and then onto the Shackleton AEW.2 in the 1970s. 50 Skyraider AEW.1 arrived in the UK between Oct 1951 and April 1956 under MDAP. These served until the end of 1960 by which time the Gannet AEW.3 was entering service.