(1) In the case of any assessment of disablement -

(a) where the period to be taken into account by the assessment began before 1 January 2012, or

(b) where there has been a provisional assessment, and -

(i) the initial period to be taken into account by the assessment began before 1 January 2012, and

(ii) any subsequent period to be taken into account by the assessment begins on or after 1 January 2012,

and where, in accordance with the provisions of paragraph (a) of section 75(10), a claimant opts for the substitution of a pension for a gratuity, the weekly rate of the pension shall be the amount specified in column (3) of Schedule 3 as appropriate to the degree of disablement assessed in his or her case.

(2) In the case of any assessment of disablement where the period to be taken into account by the assessment began on or after 1 January 2012 and where, in accordance with the provisions of paragraph (a) of section 75(10), a claimant opts for the substitution of a pension for a gratuity, the weekly rate of the pension shall be the amount specified in column (3) of Schedule 3A as appropriate to the degree of disablement assessed in his or her case.