Righto, then it's Avro Lincoln B.2 RF342, civil registration G-APRJ, which was fitted with the nose of Lancaster TW911.
Whilst used by Napier for icing research she carried Test Aircraft Serial G-29-1 (G-29-x serials being assigned to Napier test aircraft).
She was fitted with a rig on top of the fuselage to which different aerofoil sections could be attached for tests, water was sprayed onto these in flight and ice buildup observed.
This is what you're seeing as an extra "fin".
It's also worth noting that though clearly not the aircraft you mention above, that Lancaster PA474 now of the RAF BBMF was also a test-bed which carried large wing sections vertically on its fuselage top.
It conducted trials with Handley Page laminar flow wing sections at the College of Aeronautics at Cranfield
Thanks PB, very nice, not seen those before, or the others of Lincoln G-29-1.
RF342/G-29-1 has had quite a convoluted life, this is about as good a brief summarisation as any I've seen,
07/08 From Lancaster-archive/Forum: If the nose section at Paine Field is TW911 – and I don’t know that it is or it isn’t – then the writeup quoted by Wayne is only partly right. After its usefulness as a testbed was over, Lancaster TW911 was scrapped, but the nose was retained and fitted to Lincoln RF342. This ‘Lancoln’ or ‘Lincaster’ soldiered on for quite a few years with Napiers (jet engines) and then the College of Aeronautics at Cranfield until it too was retired, to the British Historic Aircraft Museum at Southend. When BHAM folded, the exhibits were auctioned and RF342 began a chequered career of different owners and many different locations, losing bits with almost every move. The nose – from TW911 - went first, I think, to store at Bournemouth, the undercarriage probably went with Kermit Weeks’ in Florida and the engines somewhere else. Being Merlin 68 or 68A with the annular radiators, they wouldn’t be much use for Lancaster, Spitfire, Hurricane or Mustang rebuilds. Finally the mortal remains of RF342 finished up at Sandtoft in Lincolnshire where it began to gently rot away. Just to round off the story, (although it should really be on Neil’s Lincoln thread), RF342 seems to have a happy ending. Last year it was bought by Mark Pilkington and shipped to his native Oz, where it is receiving love and care from him and his colleagues. It is without a nose, that having gone to the scrappie just after TW911’s was fitted but I believe that the intention is to rebuild the aircraft as an Australian Lincoln with a new nose. A long-nose B.31 would be nice.
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