(1) The first actuarial funding certificate shall have an effective date -
(a) in the case of a relevant scheme which commenced before 1 January 1991, not later than 1 January 1994, and
(b) in the case of a relevant scheme which commenced on or after 1 January 1991, not later than 3½ years after the commencement of the scheme, and
(ba) in the case of a scheme to which this Part applies by virtue of the amendment effected by section 31(a) of the Social Welfare and Pensions Act 2005, not later than 1 April 2007, and
(bb) in the case of a relevant scheme which commenced after 22 September 2005, not later than 3 years after the commencement of the scheme, and
(c) in the case of a scheme to which this Part applies by virtue of the amendment effected by section 32(a) of the Social Welfare and Pensions Act 2005, not later than 1 January 2007, and
(d) in the case of a scheme which has been excluded, in whole or in part, from the application of this Part by virtue of regulations made under sec
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