Those Lewis photos have popped in a few books over the years but rarely give much information other naming him and mentioning his DFC.
Its interesting that they are regarded as a "find" these days as the shots (clearly official publicity shots) were common in BoB coffee table books of the 60's and 70's.
Ironically I have found often a second hand "coffee table" book from the 60's is likely to have more technical detail and interesting photos of the aircraft and pilots than most modern literature which seems to rehash the same few shots over and over
