This 'guidance' to S177 from the DCMS website....
http://www.culture.gov.uk/alcohol_and_entertainment/licensing_act_2003/regulated_entertainment.htm#26

What about small-scale music events?

The venue will need an authorisation for the staging of these events.

However, section 177 of the Licensing Act provides that where:
a premises licence or club premises certificate authorises the supply of alcohol for consumption on the premises and the provision of "music entertainment" (dance or live amplified or unamplified music)

the relevant premises are used primarily for the consumption of alcohol on the premises

and the premises have a capacity limit of 200

then any licensing authority imposed conditions relating to the provision of the music entertainment will be suspended. This is subject to the exception of where the conditions were imposed as being necessary for public safety or the prevention of crime and disorder.

In addition, where:
a premises licence or club premises certificate authorises the provision of music entertainment, which consists of the performance of unamplified, live music; and

the premises have a capacity limit of 200

then during the hours of 8am and midnight if the premises are being used for the provision of that music entertainment but, no other regulated entertainment, any licensing authority imposed conditions on the licence which relate to the provision of the music entertainment will be suspended.

These suspensions can be removed in relation to any condition of a premises licence or club premises certificate following a review of the licence or certificate when further conditions may also be added to the licence or certificate.

These provisions will apply to any premises so long as the criteria set out in section 177 of the Act are fulfilled.
ENDS