Bearheart,

A few from "Songs and Music of the Redcoats" (Lewis Winstock, 1970):

Souters o'Selkirk (used as a 'rally' for the Selkirk volunteer force)
The Rogues March
Savouneen Deelish
Garryowen
Downfall of Paris (tune only)
The Sentinel (tune only)
British Bayonteers ('British Grenadiers' parody)
Farewell to Lochaber
The Soger's Return
Love Farewell
The Owl
Sahgun
Barrosa
One and All (Royal Cornwall Militia version)
Riflemen's Song (General Dundas)
Ein Scifflein Sah Ich Fahren (KGL song)

Any use?

Walrus