Source London already have a mechanism of booking a charging point up to 40 minutes ahead for £2 on top of their expensive rates 
Initially they didn't cost extra and I took advantage when driving into London in Ampera. Stopped in West London and booked one near my destination.
www.sourcelondon.net
Initially they didn't cost extra and I took advantage when driving into London in Ampera. Stopped in West London and booked one near my destination.
How do I reserve a charge point ?
Once you have subscribed and received your membership card, you can reserve our charge points up to 40 minutes in advance directly from our mobile app or from your online account. Alternatively, you can also contact our customer service team on 020 30 56 89 89. Please note that charge point...