Doug (Hagar) is correct, there are only the two airworthy Lancs, one with the BBMF and the other at CWH. The Panton brothers one is complete, and a large lottery win , a change of European legislation, and probably a large boot the the derriere of Mr BAE SYSTEMS would have it flying again.
The Trenton Halifax has come a long way in the last ten years or so, as it bore a remarkable resemblance to the Hendon one when it was raised from the lake, and well done to them too.
The Elvington one is interesting. The only bit of Halifax they had to start the restoration was the mid-rear fuselage. The wings (as Doug said) are (modified) from a Hastings, and most of the rest is newly constructed, with some original parts...
There is a Stirling project, which last time I heard was based at my old haunt, RAF Wyton. Just a very large collection of bits...
As for the Hampden - Langley, BC...
CMOF