I hate using motorway services and although Gridserve have taken over Ecotricity and are replacing many units the only time I used one I had problems. I can thoroughly recommend Instavolt. A little expensive may be but thoroughly reliable.
There are some great charging places just off the motorway. I have found two really good ones, Gosforth Costa just off the A1 outside Newcastle- 8 Instavolt chargers and good facilities.
Last Saturday I used MFG Crow Orchard near Wigan. Charging was quick and easy and again the facilities were good.
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In future I am going to search out places like this rather than get stressed using the motorway.