it appears to be #EuroCarParts and #GSF (both owned by USA #LKQ group) that are leaking data to #Facebook about me working on more than one car (I'm not sure what they gain from doing so, as FB is equally likely to suggest ads for one of their competitors)

https://themarkup.org/blacklight?url=eurocarparts.co.uk&device=mobile&location=us-ca&force=false