This Part applies to an EU financial sanction imposed on the United Kingdom if—
If a certificate under subsection (1)—
this Part applies to the sanction as if it included only that part or those parts.
A certificate under subsection (1)—
Any provision of a certificate under subsection (1) which has the effect of excluding the whole or part of any periodic payment mentioned in subsection (3)(a)(iii) (including any such payment which has fallen due from the United Kingdom since the earlier certificate was given) may be varied by a further certificate under subsection (1).