These charge points are certainly not required for Twizy with an expected install cost of between £1000 and £1500, they must be good.
Owners expected to pay a min of £250 to £750 of that.
By the time I need one of these points the subsidy will be long gone.
IMO most people will pay £330 because that will allow the installer to claim the maximum grant £1000 (75%).
The grant is available until April 2015 so if you invest in a qualifying EV before then you can have a shiny new Charging Station