Hmm Still a hill to climb - tried to do one of these in Gayfield Square in 1998 - 13 years ago.
Lambeth has done some.
Would direct to the solution that the Dutch use, small 5-6 bike bread bins, as these can accommodate a wide range of bikes, and have capacity to squeeze in a visitor if needed - lockers may be too inflexible and also bulky with high cost in area & price per bike, for a wide general application.
Electronic locking and tagged bikes/tagged locks (that set of alarms when 'broken' without authority) are possible now. Very similar to the systems used for OYBike and Cycledock which do not require main or telecom connections. Thus your bike can be locked in the street and you get access using mobile phone/smart key fob. If interfered with you get alert on mobile phone/e-mail.
I know sources for technology and contacts. The automated Brompton Dock hire system uses bike i/d tagging to register that the known bike is returned to the allocated location. A unit like this with solar powered locking and GSM data transmission can be installed and commissioned in under an hour on a parking bay which is sensibly flat and level. Levelling frames may be required for uneven surfaces.
For the original Gayfield Square work I sketchde up some end panel detailing (castings/lasercut steel) to soften the functional steel frames by using profiles that matched local ironwork (balconies, balustrades etc)
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