Yep...thats what I'd heard about the Scots Greys - apparently in the 'horsey set', a white horse is always termed a grey anyway (or it was in times past anyhow, I dont know about now). The grey cloth mentioned by Teribus is interesting though....& maybe has some truth in it, who knows?

The Grenadier Shako (not the Bearskin, which was, yes, because of the British Foot Guards playing a big part in breaking of the Grenadiers of the Old Guard at Waterloo) came in because the Bicorn hat would get in the way, as Ozmacca said.

Regiments that havent been amalgamated? Not many - The Green Howards (previously the 19th Foot, but originally Luttrell's Regt. (that predating Colonel Howard, & the green 'facing' colour even) is one, & the Duke of Wellingtons Regt. (33rd Foot...cant remember their original (ie: Colonel's name)) is another. There are a couple more I think, but cant remember them offhand... I'll have to look them up.

Prince of Wales Own Regiment Of Yorkshire was formed just from the West Yorkshire Regt. & the East Yorkshire Regt. - in 1968 I think it was, along with a large number of others.