Take these chains from my shed and set me free

From the archives:

We have discussed the Walthamstow Cycle shed with the Council. The shed has not worked efficiently for some time and we agreed that the automatic locking system should be disabled with a view to being replaced by Sheffield stands. We think that cyclists will be unlikely to pay 50p a day for parking. A manual override would be installed in the shed to ensure no one was locked in again.