There are some photos of damaged Lancs - I'll see if I can find some. ( Bill Reid won his VC for returning in a Lancaster which was a total flying wreck ).

But here we come up against the very different attitudes of the US and British authorities. Whereas photography was actively encouraged on US bases, it was actively discouraged on British ones ( taking photos privately was strictly forbidden ). I would imagine that damaged aircraft were frequently left unphotographed as being 'bad for morale'.

From a historical perspective, this is sad : there are so many wonderful 8th AF photos, whereas British ones are mainly 'official' posed shots, etc.

Also to be borne in mind is the very different war the B-17 and Lancaster were fighting. Flying through colossal daylight flak, and hit-and-run Luftwaffe attacks, the Forts often took incredible punishment and survived. In the night sky, flak was frequently either a direct hit or a clear miss ; and nightfighter attacks were calculated and very close-range. So Lancasters tended either to return virtually unscathed - or not return at all......

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"Stand by to pull me out of the seat if I get hit" - Guy Gibson