Islington not the only ones...
We work for bars and clubs in Westminster and in Camden.
And the "must have CCTV or you aren't having a licence" policy is the same.
One of them (Camden I think) also requires the CCTV recordings to be kept for at least 30 days.
Whether this is a legal requirement or not I couldn't tell you - but in many areas (Westminster esp.) it is Police policy to oppose all licence applications / variations if they deem the area a "high pressure zone" - irrespective of the merits / specifics of the application.
1 client told the conversation went like this:
Licence Holder: We'd like to get a variation on our licence
Police: We object
LH: ok - what's the objection?
P: It's policy to object
LH: Even if there's nothing to specifically object about?
P: It's policy to object
(repeat)
Anyway.. this sort of attitude means that all venue owners will put in the CCTV irrespective of whether it's a legal requirement or not, because not doing so is likely to "displease" the licensing committee and losing / not getting a license variation could be a very expensive problem...
Although I wouldn't worry about the CCTV in pubs etc anyway.
The quality is usually rubbish, half the cameras don't work half the time, and unless it's a really serious assault (or worse), the police won't gather / watch hours of CCTV
(I've offered to courier them the HDD from the recorder so they can get the footage themselves in the past and the answer was "no thanks we don't have the ability to do that".)
if it's anything not life threatening - then the process is so slow, that a venue won't even get a request for the CCTV for several weeks (by which time it might well have been overwritten)