The British Transport (Pensions of Employees) (No. 2) Order 1969

2.  Where a discharged officer is entitled under his pension scheme, on his discharge, to receive any payment by way of a return of contributions paid by or in respect of him, with or without interest thereon, he may, at any time within three months of the date of his discharge exercise his right to receive such a payment; and where such a right is exercised by any person the subsequent provisions of this Order shall not apply to him, and the persons administering the scheme, the persons in whom any fund held for the purposes of the scheme is vested, and the responsible body shall be discharged from all other liability under the scheme to or in respect of that officer or to any other person by reason of that right having been exercised.