Settled Land Act 1884

If in a settlement, will, assurance, or other instrument executed or made before or after, or partly before and partly after, the commencement of this Act, a provision is inserted purporting or attempting, by way of direction, declaration, or otherwise, to forbid a tenant for life to exercise any power under this Act, or attempting, or tending, or intended, by a limitation, gift, or disposition over of settled land, or by a limitation, gift, or disposition of other real or any personal property, or by the imposition of any condition, or by forfeiture, or in any other manner whatever, to prohibit or prevent him from exercising, or to induce him to abstain from exercising, or to put him into a position inconsistent with his exercising, any power under this Act, that provision, as far as it purports, or attempts, or tends, or is intended to have, or would or might have, the operation aforesaid shall be deemed to be void.

For the purposes of this section an estate or interest limited to continue so long only as a person abstains from exercising any power shall be and take effect as an estate or interest to continue for the period for which it would continue if that person were to abstain from exercising the power, discharged from liability to determination or cessor by or on his exercising the same.