There are plenty of brass bands outside mining communities. In my youth one of the top bands was the GUS Footwear Band, then there were the CWS Band (a tobacco factory), Black Dyke Mills, Fairey Aviation and the Brighouse and Rastrick band was a temperance band. There are also Silver Bands which are brass bands that can afford more Duraglit. We had one in Bethnal Green (not in the North at all).
Oh, and then there's the Sally Ann..

Here's a link: http://www.harrogateband.org/ibew.htm