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That's something that worked for someone once; there's no guarantee it'll work every time. The main point in it is really that you should leave any confrontation with a seller to the police. It obviously depends on whether they have the manpower etc. to deal with the situation at that time. The best method is to keep the police in the loop from the beginning.
The police would certainly take the bike away at first but all they'd require to return it would be proof of ownership.
Well, not my bike but my brother's, who bought it of @nonowt, who also found it again on gumtree yesterday. It was stolen early March and now stars in a dodgy gumtree listing. What to do?
@Oliver Schick 's 'What to do if your bike is stolen' thread talks (at the end of the 1st post) about contacting the seller and setting a meeting place / time and letting the police take over from there. That really work? You rock up at a police station and invite them to come catch a bike thief for you? And wouldn't said police then also take the bike away?