2014 flight by a Lancaster over Derwent Dam in Derbyshire to commemorate practice runs made by 617 Sqn. in preparation for the 1943 Operation Chastise "Dam Buster" raids.
Interesting image Graeme, which book did you scan the image from, or did you find it on the net? Never seen that before. Looks like its testing the annular radiator installation on the Lincoln.
Grant, the pic in Post #69, or at least one very like it, of the same veteran Lanc, is in the 1960's Harleyford book 'Lancaster - The Story of a Famous Bomber', by Bruce Robertson.