A supply point number is a number that energy companies use to uniquely identify your property. For electricty this is called an MPAN or supply number. For Gas this is called an MPRN or MPR.
This stands for meter point administration number. Every property in the country should have one. It can be found on your bill on page three and looks like this:
MPRN stands for Meter point reference number. You only have one of these if you have gas at your property. This can be found on page four of your bill.