TubeNet

one of the best for brass scores is :-

http://www.justmusicuk.com/" target="_blank" target="_blank


I don't know if much of George Allan's music is published ( I have played the Wizard and Battle Abbey which were on manuscript) I know Knight Templar and the Senator are published but not supplied with a study or performance score. at £15 from Just music.

In the USA, try Solid Brass Music Company. I've ordered from them with good service.
http://www.sldbrass.com" target="_blank