The procedure to switch your gas supplier is as follows:
1) Contact your supplier and ask them to provide information about your new supplier.
2) After providing information about your new supplier, your supplier will contact your old supplier and say that you have to switch supplier.
3) After providing information about your old supplier, your supplier will contact your new supplier and say that you have to switch supplier.
4) After providing information about your new supplier, your supplier will contact your old supplier and say that you have to switch supplier.
5) After providing information about your old supplier, your supplier will contact your new supplier and say that you have to switch supplier.
6) After providing information about your new supplier, your supplier will contact your old supplier and say that you have to switch supplier.
7) After providing information about your old supplier, your supplier will contact your new supplier and say that you have to switch supplier.
8) After providing information about your old supplier, your supplier will contact your new supplier and say that you have to switch supplier.
9) After providing information about your old supplier, your supplier will contact your new supplier and say that you have to switch supplier.