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Out here in LB Hillingdon such vehicles are used to capture Court approved quality video of miscreants. Typically it could be selfish parents parking on the hatched lines outside school entrances, yes the ones that also have the text 'School No Parking', or across householders driveways.
The clearest local cases were where busses were unable to follow their route as cars had been parked all the way up to 'T'-junctions, meaning there was just not space for the busses turning circle. Such junctions now have double yellow lines for the 10 metres leading upto the junctions.
I think it is to offer some safety as pedestrian traffic wardens are often abused/threatened by self-entitled jay-parking motorists.
@cgg
One possible cause is wear difference between chain and cassette. But you're saying both are new-ish so I don't know.
I have a question as well. I live in Islington and sometimes see small council cars driving around, equipped with video recording gear (on the roof). I think there's "CCTV car" written on them as well. What's the point of this? Are they hoping to catch a criminal red-handed or something?