British-style Brass (or silver) bands don't have any "marching" tradition,
The modern form of competition was represented in the film Brassed Off a
film about the troubles faced by a colliery brass band, following the closure of their pit. The soundtrack for the film was provided by The Grimethorpe Colliery Band, and the plot is based on Grimethorpe's own struggles against pit closures.

Those videos are pretty amazing Azizi I bet those kids in our kazoo "jazz bands" bands would love to see them!