That said the question is about data protection and CCTV
Hi Sophie
The ico does not like audio recordings with CCTV system besides anything else it also breaks a few privacy laws, and unless your system is fully compliant with the DPA the CCTV would not be admissible in court anyway
It sounds like you are having environmental problems you can get more information on what to do here https://www.gov.uk/local-environmental-quality
I would swerve the swan kit like my life depended on it.