Hi Karen,
Sorry for the delay in replying.
I'm looking at his early service around the time of the Dunkirk campaign at the moment (he was in 24th Field Regt RA at that time), I've contacted the Royal Artillery Museum who are sending me the pages of the War Diary for that period. They seem to hold quite a lot of records there and have a Reading Room that you can use for £10/day. I'm hopefully (work and small child permitting) to go down there later this year, I'll let you know how I get on.
I also contacted the Veterans Association and got hold of a copy of his service Record which gave me a few clues as to where he was (you'll need permission from the next of kin and a lot of patience for that one, it takes between 6 & 9 months to get it back due to demand) and since my last post I've come into posession of his medals he seems to have been everywhere in the Western Theatre.
If I find anything else out I'll let you know.
David