In reply to Pursued by a bear:
> No. Named more for them being a brass band .....
Except, of course, that they're not. At least not in the traditional British sense of Brass (/colliery) Banding. They're more like a New Orleans style Jazz band with an ironic hipster name.
Having said that, the 'Hackney' Sousaphone player from your clip used to sit next to me (playing EEb Bass Tuba) at 'Aveley and Newham Band', which IS a traditional Brass Band despite being from the South and not having a single member that owns a whippet or a flat cap.