http://www.lga.gov.uk/lga/aio/18819474

John King comments:
LGA briefing document for the Police Reform Bill. If this amendment is successful, premises with restrictions on the number of live music events in a given period will NOT be able to use a TEN to put on an extra live music event.

Similarly, a premises with a notorious "genre" restriction of 'jazz', would not be able to put on a folk event by way of a TEN.