So far all of the Regiments that I've come across in grey uniforms have been either from Middlesex or Scotland - for Scotland, look up the modern tome 'Vanished Armies' (2009) for pictures of the Cameronians. Middle top row of the front cover is 5th Bn Cameronians for example. For Middlesex see below.
|Plate from 'The British Army' by 'A Lieutenant-Colonel in the British Army', 1899|
|Plate from 'Her Majesty's Army' by Walter Richards, 1890.|
Some points about the uniforms. Firstly, blanket should be the same colour as the rest, but with the same colour for helmet, tunic, trousers and gaiters I thought I needed to add a slight contrast with the blanket. Secondly, uniforms at this time didn't all have brass buttons and fittings - I just like them so standardised on that. However, real grey uniforms seem to go with steel/silver or whatever - and brass wouldn't have seemed right anyway. Rifle slings appear to be brown rather than white. Finally, just had to go for the black facings...