Well, I couldn't say where you acquired them from
but they were originally from the Imperial War Museum's photographic collection. To read the captions of the three colour photos enter the the number (TR etc at the bottom of the photo) into the "Photograph Number" box:
http://www.iwmcollections.org.uk/qryPhotoImg.asp
BTW, the captions may not necessarily be 100% accurate - I've found a number that weren't, and if proof can be found of mistakes they will change the captions.