Where in any tax year the trustees or managers of an occupational pension scheme make an increase in a person’s pension, not being an increase required by section 109 of the [1993 c. 48.] Pension Schemes Act 1993 or section 51 of this Act, they may deduct the amount of the increase from any increase which, but for this subsection, they would be required to make under either of those sections in the next tax year.

Where in any tax year the trustees or managers of such a scheme make an increase in a person’s pension and part of the increase is not required by section 109 of the Pension Schemes Act 1993 or section 51 of this Act, they may deduct that part of the increase from any increase which, but for this subsection, they would be required to make under either of those sections in the next tax year.

Where by virtue of subsection (1) or (2) any pensions are not required to be increased in pursuance of section 109 of the Pension Schemes Act 1993 or section 51 of this Act, or not by the full amount that they otherwise would be, their amount shall be calculated for any purpose as if they had been increased in pursuance of the section in question or, as the case may be, by that full amount.