Lancaster B X FM213 in Canada is airworthy (Canadian Warplane Heritage Museum)
Lancaster B 1 PA474 "City of Lincoln / Phantom of the Ruhr" in the UK is airworthy (BBMF plane)
Lancaster B VII NX611 "Just Jane" has been taxiable for many years, but because two serviceable Merlins have been found, its going to be restored to airworthy (Lincolnshire Aviation Heritage Centre)
Lancaster Mk 10P FM212 "Bad Penny" is being restored to airworthy in Windsor, Ontario (Canadian Historical Aircraft Association)
Lancaster B X KB976 might be restored to airworthy at Fantasy of Flight, Florida by Kermit Weeks.
So, there might be life in the old girls for a while yet...
What I would like to know is why no Mosquito was preserved for the BBMF.
http://en.wikipedia.org/wiki/List_of_surviving_Avro_Lancasters