(1) Where a person referred to in section 81L(1)(c)(i) applies to the trustees for the payment of the benefits referred to in section 81L(1)(a) and the trustees are not satisfied that the contributions, that are required to be paid into the scheme by the member for the purpose of that member obtaining entitlement to those benefits, have been paid, the trustees shall -

(a) calculate an amount, in respect of those contributions, to be paid into the scheme and the interest (if any) applied in respect of those contributions under subsection (4), and

(b) notify the person in writing of the required amount.