Regarding the 2 comments below:
“It’s worth noting, however, that if you have security video surveillance in your building, you must have signs up alerting visitors – not so much for privacy law reasons but for Work Health and Safety issues.”
“I read a while back, in the newspaper I think, that people can be filmed, say with CCTV for example, but cannot be recorded unless they knew they were being recorded”
Just letting you know, I was allowed by Police & the Court to record & use as evidence in court other residents using common property (ie letterboxes, in front of my front terrace, in the driveway outside my bedroom, etc) WITHOUT any notification to anyone, I was doing this as it was for my own protection (I asked the Police beforehand if I need to put up a sign).