Which British regiment is this?

and they look magnificent on parade.

Royal Scots is the oldest serving regiment in the British Army, also, Coldstream is on the border and has both Scotsmen and Englishmen in the ranks. A close friend of mine served 35 years and he was from Cornwall in England

Davy, Livingston. Also so unfair Buttons not Clear. Childhood memory of Uncle in Coldstream Guards at Chelsea drilling me in the Order of The Buttons .