You probably know this already but, just in case, here is an extract from Victor Bingham's book "Whirlwind":
P6994 To 51 MU 24.01.41. To 263 Sqn 13.02.41. Returned to works 29.03.41 and again 01.11.41.
To MU on 14.02.42 then shipped to the USA on 05.06.42.