Just off the phone to Scottish Power (Sales) and they tell me it is not possible to switch from SSE to them on an E7 tariff (I have an E10 meter installed). The guy spoke to his manager and was told that I would need to have an E10 meter supplied by Scottish Power as the current meter was installed by SSE. I insisted that it was just an E10 meter with two readings normal and off peak but the guy was adamant. Wonder if it was my location, I’m in Cumbria. Very confusing but I’ll speak with Customer Services tomorrow and see what they say!!