This is the second prototype T.Mk.2 that flew for the first time on
July 14, 1969. Used for trial work from its maiden flight on, it was
converted to a T.Mk.4 in 1973 and to a T.Mk.4A in 1983. Lately it has
been involved as a test-bed in the Vectored thrust Aircraft Active
Control (VAAC) program. It is still in use at QinetiQ.