Thanks for identifying Marshall in the group photograph, he was causing me some concern!
In the second photograph, if we take R. A. Logan at 12 o'clock; F. S. Schomberg at 2 o'clock; C. Picot at 4 o'clock; 6 o'clock Not yet identified; 8 o'clock T. W. J. Lloyd & 10 o'clock M. V. Hornidge. I've yet to establish the identities of the centre trio.
Drop me a pm and I send you a larger format version of the group photograph, in the meantime I'll try and add the names I have so far to it, and post it later.
Not theirs to save the day but where they stood, falling, to dye the earth
with brave men's blood for England's sake and duty...