They haven't sent me any reply yet. Either they've decided to ignore me, or they're working on a proper reply. Probably the former.

But reading the reply - does that mean there is a Public Entertainment Licence covering the beach all year? OR if you chose to sing a song on the beach outside that two week period, would you be offending against the law?

But of course they have completely ignored the central question, which is "Under what circumstances does Weymouth Council consider that the act of singing or playing a musical instrument becomes something that is to be classed as 'Public Entertainment'?" Which is a pretty simple question.