There are also some at Reading Services, 2 or 3 years ago Instavolt got planning permission to install chargers at Corley Services but they never got installed. It would be nice to see more chargers at MSAs but i suspect like everything at services they will be very expensive.
I don't think it helped that they gave the electricity away free for years. I believe Nissan paid for the chargers, didn't they? Therefore if they'd charged for the electricity, they'd still have some money in the kitty to repair and update the chargers. Source London seem to manage, (though they are eyewateringly costly to charge at.)