Busking ban for Abergavenny?

It was inevitable that a ( very helpful ) council official should eventually quote the Live Music Act 2012 and suggest a £20 licence was required for us to continue busking. The occasion was Abergavenny Food Festival and the problem was the amp that carried our back tracks for the saxophone set.
While generous stall holders kept us in free refreshments, the council official had to be persuaded to let us carry on.
Anyone else run into this problem? Is it true you can't busk with an amp? (Or simply that you must stop playing if someone complains.)

Class Act

Hot out of uni, fiddler Edward Pullin is giving it his best on the street. Drive the Cold Winter Away is a traditional English tune. Good to see some English fiddle tunes making it to the surface amongst a welter of Celtic sounds.