Just to emphasise a point Jonny69 touched on. Do not leave decent bikes locked up too long anywhere. Even if the thief can not get through your hundreds of pounds of heavy steel locks and tethers, it is scary the number of stripped frames you see locked up securely around London.
It actually takes seconds to strip your bikes brakes and shifters if you are not too worried about scratching the bars or damaging the grips!
It actually takes seconds to strip your bikes brakes and shifters if you are not too worried about scratching the bars or damaging the grips!