I agree the Boris Bikes have got much more reliable in the last few months. I got really fed up and stopped using them last autumn because they were so unreliable. I had repeated instances of not being able to get bikes out of docking stations. I started using them again in January and since then have not had a single instance of not being able to get a bike out. Hooray! Also the length of time you have to wait to get a green light is now much less!