21E+W+SAny determination or direction—
(a)which has been made as respects a public gas supplier, or given to such a supplier, under section 15B of the 1986 Act (promotion of the efficient use of gas); and
(b)which is in force immediately before the appointed day,
shall have effect on and after that day as if it had been made as respects, or given to, the supply successor of that supplier under section 33BB of that Act.