(1) In this section -
"accountable person" means a bank or promoter within the meaning of section 124;
"base period", in relation to a due date, means the 12 month period ending on 1 April immediately before the due date in respect of which a statement is required to be delivered to the Commissioners under section 124;
"chargeable period", in relation to a due date, means the 12 month period ending on 1 April immediately after the due date commencing with the 12 month period ending on 1 April 2009 and each subsequent 12 month period in respect of which a statement is required to be delivered to the Commissioners under section 124;
"due date" means -
(a) in respect of the 12 month period ending on 1 April 2009, 15 December 2008, and
(b) in respect of each subsequent 12 month period, 15 December in the preceding year;
"preliminary duty", in relation to a chargeable period ending immediately after a due date, means an amount determined by the formula -
A x B
where -
A is an amount eq