You can find your MPAN number (unique reference number for electricity meter) on the electricity bill from the previous supplier. It will usually be in two rows with a large 'S' next to it and will look something like this:



You can also find your MPRN number (unique reference number for gas meter) on the gas bill from the previous supplier. If you don't have your gas bill you can get your MPRN number by calling the National Grid on 0870 608 1524. Your MPRN number will be 10 digits long and will look something like this: