Ever since United's bankruptcy, the company had not put any transfers through to the foreign bases other than for the flight attendants who were displaced from Taipei, Paris, and Santiago upon those base closures. In recent weeks, the company has awarded nearly 100 transfers to LHR. I know 3 flight attendants who have personally accepted their transfer award to London.
A reason for the recent transfer awards is that the LHR base has been losing flight attendants who were based there, but who commuted from east coast cities. LHR has a prohibitively expensive departure tax, and flight attendants who jumpseat to and from LHR, must also pay. Additionally, the dollar is rather weak against the British pound at the moment, which makes LHR a very expensive place in which to be based.
Nevertheless, it is encouraging to see transfer movement after so many years of being closed to transfers.