I currently have electricity with Scottish Power (they wouldn’t let me switch when I moved!) and will be getting gas pipes supplied to my new property soon. Can you install a gas meter and provide the gas, even if SP supply the electricity?
@ctim, why would they not let you switch?
Unless you’re in a significant amount of debt on a pre-pay meter (over £500 IIRC), or have a debit in your account that you’re refusing to pay with a credit meter, I don’t believe there’s anything they can do to stop you moving.
You would however likely be best off getting the gas meter installed by Scottish Power, and then switching both together.
Bulb don’t do a gas only tariff - only an electricity only one.