Okay, UK only so not for me :)
Anyway, I had a look at the mockup. That looks pretty neat and useful. It looks like you're targeting CHAdeMO fast-chargers (exclusively?) that's a neat trick and I'd like to have something like this for bigger trips (I currently have to plot longer trips manually by checking ChargeMap or similar apps, making sure the charger is actually working, and then adding a waypoint in Google Maps.)
One thing I noticed though is that the third charging point (this one) is at a car dealership. Now I'm not sure about the UK but here in The Netherlands some these are behind gates and only accessible during business hours. Do you accomodate for these things in the app?