Hey!
My mates busk all over the south west of the UK, and say that the amount of money they earn comes as compensation for some of the shite that they get - there are some serious arseholes over here! However, there are more nice people than nasty... and they tend to make between £30 and £60 every three hours or so, depending on the town....
... a tip would be: some places require you to have a permit, if anyone asks if you have one, just say yes, or say that it's being dealt with at the council offices. Should work a treat to get anyone off your back!
xx