(1) After clause (2)(a) of Schedule 3 to the Principal Regulations insert —
"(ab) in the case of a vehicle other than a heavy vehicle and for the period starting on 1 April 2012 and ending on 29 March 2013, 18·54 fee units; or".
(2) In clause (2) of Schedule 3 to the Principal Regulations, for "paragraph (a) or (b)" substitute "paragraph (a), (ab) or (b)".