Firstly, it's not covered by RIPA / DPA because its not personal data from which an individual can be identified.
Secondly, there's an exemption for the detection or the prevention of a crime - in this case, causing an accident and failure to leave details.
Legislation isn't what you need to worry about - its whether the pub owners can be bothered to co-operate.
Now why do I think that you didn't get very good marks in your data protection exam.......
your right, but as i would suspect you know it all can become a bit of a minefield. The issue for me would be if things were to go wrong, couple of scenarios spring to mind, you see the accident but not the registration number of the car, the tape shows the car normally parks nearby, landlord says “don’t worry mate I’ll keep on eye open and get it for you and make sure the camera gets it next time”
Or you’re watching playback and see your other half having it away with your best mate, you go around and tw** him, questions asked how did you know what was going on?
I know, both are extreme and unlikely, but I am a half glass empty type person!
Again, your right, owner of system would more than likely not want to help, but because it’s a car and a drive away, well everyone hates tw*** who pulls stunts like that.
Never taken any DPA exam however, what does bug me though is the fact that there is an assumption that everyone can have access to CCTV, its bad enough with all the statutory bodies who have some controls over them, let alone private operators.