The 'privacy guidelines' in question being the Data Protection Act, which is fundamentally a set of laws related to data processing. In this case, CCTV tapes could be stolen and the cameras themselves are not always signposted.

As the linked post demonstrates, privacy issues are covered by the Act - but as far as I'm concerned, you have no privacy whether half a dozen strangers are watching you in the street or whether you're being broadcast to the whole world.