Terrific find Andy! I'm not sure about the event, but the familiar face of Lieutenant-Colonel Peter J. Luard can be seen second photo down in first post. Regards ...
I don't think I've seen that photo of Peter Luard reproduced anywhere else before. He took a hunting horn to Normandy with him to be used for rallying the 13th Battalion after it jumped. The call was 'L' for Lancashire which makes him a pretty cool bloke in my eyes.
Thanks for these excellent photos. The building in the background of the first and third pictures is the Northern Assurance Building on the north side of Albert Square, which is still there today. See ... http://www.geograph.org.uk/photo/3898595