From all written and brainstormed here in the last few days, I could definitely see a platform that provides opportunity for bike shops to rent out would do the job, mainly in London.
The platform would provide booking, payment, division into 3 groups with same pricing across the board and return to same spot, and use group purchasing power to negotiate insurance deal.
It would combine all ebike facilities available, starting in the bigger cities (London, Manchester etc) and eventually move across the pond - giving small store owners the booking & marketing power to draw renters from all over the world, all based on the same lease contract & terms with platform taking % fee per rental.
Platform, as Trex mentioned, needs no maintainance of locations & bikes etc. The only thing I would do is maybe have 1 main location (similar to Avis Prestige) that will carry the real top premium bikes in the trade, for a cash loaded Chinese family or a Sheikh on visit from Qatar...
Trex, you put me on steroids here