When I worked in a bike shop we used to recover one or two stolen bikes a month, always the same style.
Some scrote would come into the shop wheeling a bike that obviously wasn't his and ask us either to fix it (usually a puncture) or ask if we wanted to buy it. In either case we'd take the bike off to be repaired or for a "valuation" and then just not hand it back
Yep, used to do that in my place as well, BITD. Only we used to add a little extra in that while the mechanic had taken the bike out back for an "assessment" he was actually on the phone to the local police station (A hundred yards away, and full of very loyal and well looked after customers of ours!).
So, scrote would be loitering around the shop feigning interest in stuff, whereupon five or six of the Met's finest would saunter in, giving it the "'Ello, 'ello, 'ello" treatment.
"You, son, is nicked"