Interesting. I am also in Cumbria and have been told multiple times by customer services that Scottish Power are able to offer economy 7 to an already-fitted economy 10 meter. My upstairs neighbour has successfully done this and is now with SP. See below for more discussion on switching to Scottish Power and tips on how we managed to achieve this. I will posting the latest best tariffs soon after I attempt my own switch next week.Will be interesting to see how you get on!