Moving house soon - Any advice re - Metering

I have finally sold my money pit and should be moving out next month into a much smaller property. I have been researching on the net as I will be alone and not using anywhere near as much gas and leccy as I currently do (No CH for starters) The same results for my guestimated usage keep coming up - I.E. Ebico and I must admit I do like the thought of their ethics.

I currently have a combined online, economy 7 tariff from powergen and a comparison between potential bills shows a difference of £150 pa!..... But the new house still has a card meter for the electric and I really would like to have a two rate credit meter and teleswitch installed. How would I go about this, transfer to Ebico and then get them to change the meter, stay with powergen for the move, get them to swap the meter - They like me and would be happy to do that as I'm a "Good Customer" then swap to Ebico, or, is their another route I have missed. Any help or pointers appreciated.

TIA.