Which camera system? Do you have a citation for that?
https://www.thewestmorlandgazette.co.uk/news/17327294.cctv-c...
https://www.bbc.com/news/uk-northern-ireland-22792013
Anecdotally my Mum works for Coventry City Council (though she is in events planning) but has noted complaints from colleagues about “busy work” from “fussy old people who keep asking for camera footage” — though Coventry often declines.
Information on those cameras: https://www.coventry.gov.uk/cctv
The UK doesn’t have a super camera system used for minor crimes like you insinuate.
The high camera counts in the UK come from including private CCTV cameras in the data which privately owned and are not linked together, hence the government is not using a network of cameras to monitor dog poo clean up as you claim.
This totally makes sense, having one cop checking 100+ CCTV is far more efficient than a full team walking in the streets. Once you justified the cost on privacy and managed to deploy such system, it's so easy and convenient to use it for something else.
This is on top of the cameras that ARE owned by government entities - 18+ city councils [2]. And it's expanding [3].
Why do you think it matters if they are linked together? Retaining footage and handing it over to police on request (not warrant) is a requirement. The IPA allows collecting this information in bulk (eg from cctv providers) with warrants. [4]
[1] - PDF Warning https://assets.publishing.service.gov.uk/government/uploads/...
[2] - https://www.bbc.com/news/uk-england-17116526
[3] - https://abcnews.go.com/International/wireStory/uk-funds-stre...
[4] - https://www.legislation.gov.uk/ukpga/2016/25/contents/enacte...