Hi Frank,
It's Volume 1 if you can still get a copy although, it won't tell much more than what I put in the response. It doesn't give any citations just the corresponding dates to the Gazette entries.
He is publishing another book later with some more information which I'm hoping to get a copy of.
I have the same problem as you in that, My G Grandfather won the MM but there's no citation and nobody in the family knows why!
As for the War Diaries, they're on Ancestry if you have access? If not send me a PM and I'll look them up again for you.
Regards
David