4.—(1) Paragraph (2) applies to every—
(a)licensed electricity supplier; and
(b)licensed gas supplier which is connected to a licensed electricity supplier.
(2) A supplier to which this paragraph applies must notify the Authority by—
(a)14 days after the commencement date; and
(b)14th February in each of the years 2012, 2013 and 2014,
of the number of that supplier’s domestic customers on the preceding 31st December.
(3) If, before the commencement of these Regulations, a supplier has notified the Authority of the number of that supplier’s domestic customers on 31st December 2010, the Authority shall treat that as the supplier’s notification for the purposes of paragraph (2)(a).
(4) If a supplier does not notify the Authority in accordance with paragraph (2), the Authority shall determine the number of that supplier’s domestic customers on the preceding 31st December.
(5) For the purposes of this regulation, a supplier’s number of domestic customers is the number of domestic customers to whom it supplies—
(a)electricity (other than as part of a supply of dual fuel);
(b)gas (other than as part of a supply of dual fuel); or
(c)dual fuel,
with a supply of dual fuel being treated as a supply to two domestic customers.
(6) For the purposes of the following regulations, a supplier’s number of domestic customers is the number notified or determined under this regulation.