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(a)     in the case of 1987-88 or any subsequent tax year, from [so much of his earnings as did not exceed the upper earnings limit and] upon which primary Class 1 contributions have been paid or treated as paid and from Class 2 and Class 3 contributions; and

(b)     in the case of any earlier tax year, from his contributions of any of Classes 1, 2 and 3;

(a)     establishing, by reference to the satisfaction of contribution conditions, entitlement to [a contribution-based jobseeker's allowance[, to a contributory [an] employment and support allowance] or to] any benefit specified in section 20(1) above, other than maternity allowance; . . .

(b)     calculating the additional pension in the rate of a long-term benefit[; and

(c)     establishing entitlement to a state pension under Part 1 of the Pensions Act 2014 and, where relevant, calculating the rate of a state pension under that Part][; and

(d)     establishing