And is there any infotmatyion at all about the situation as regards places, such as coffee bars, which don't have or wish a liquor licence but might be willing to have a bit of music from time to time? How much are they expected to pay?

Everything I have seen about this from official sources completely ignores this aspect. And this is in what is allegedly a multi-cultural society, where there are, for example, sizable Muslim communities with musical traditions of their own who do not in general see pubs as as their kind of places.