They certainly were deployed to the UK (from 1948) with the USAF and from 1952 87 were used (named Washingtons) by the RAF. The long range of the B29 made it ideal as a cold war threat to Russia, however rapid development of jet aircraft and the use of the B29 in Korea meant their use by the USAF was short and their bomber service with the RAF was very short, although a few ELINT Washington's were retained until 1958.
Although the RAF used many ex-bombers (and also flying boats) during the Berlin airlift, the USAF used only dedicated cargo aircraft (mainly C54s but early on C47s and for a special mission 5 C82s)