I was leaving my flat, saw him hovering around my bike looking furtive. I wandered past to see what he was up to, then looking back saw he was unscrewing the handle bars which are fixed with a single hex bolt. He would have got the bike minus the handlebars which had a support bar which was securing the entire frame. I'm taking in the photo I took of him on my phone to the local police tomorrow.
Well yes, but It's a further deterrent. A professional thief will get your bike whatever you do to stop them, but I imagine a fair proportion of stolen bikes are down to opportunists and addicts looking to make quick cash. The likelihood they have anything other than a set of Allen keys and a bolt cropper ready to hand is going to push them toward the easier theft.