Source London (London Charging Bays)
If you are looking for a charging bay around the London area then you may want to join the Source London program its run by Transport For London (TFL) and for an annual fee (£10) you are provided a membership card to unlock the charge points and recharge for free.
The only other fee you have to pay is for is parking at the bay and these are different depending on the local borough parking rates.
Have just joined up as often around London area for work so would be rather handy to use. I will post up details once i try one of the bays out once my membership card arrives.
For more details on the scheme visit Source London
and for a map of the points