Wainfleet,
Thanks so much Chum for posting the images, most interesting indeed - love the latter "Buffs" one!
You say its is
most probable the the rim less type was still being issued at the time of the Somme? As no expert in the micro detail of these matters, I do however seem to recall that the 2nd Patt with rim was issued in March 1916 onwards...? I'm always willing to be prov on wrong things

, so is it recorded anywhere that new army units where getting the 1st patt just before the Somme?
I'm not tryng to be too much of an anorak on this

and bottom line in context to reconstrution we will have to go on the available weight of evidence as to what was likely to have been issued to 18 DLI.
The colour question is fascinating I must say, but hopefully will be best place to reproduce this as best we can.
In answer to Wardog and the actual sources of helmets, then yes mate, we do have a source of repro WW1 British Brodie helmets in either pattern/in all of the colours and all of the finishes - but not here in the UK.
We did not want to go with re modled WW2 one's if it could be helped, as they did not have that right profile if you know what I mean. If you want more info please PM me.
As to the covers - there's another conversation! Sand bags, size and pattern of how one covers ...

in half or made in quarters!
The quest continues...
Kind Regards
Gary
The Durham Pals 1914 - 1918.