Pan roddwyd y trefniant hwn ar waith, disgwylid y byddai Llywodraeth y DU yn derbyn tua £2 biliwn dros cyfnod o 25 mlynedd. Ond rwy’n deall bod yr holl adenillion gan Gynllun Pensiwn y Glowyr ers yr adeg honno, i wahanol Lywodraethau'r Du, wedi bod tua £4.5 biliwn, gan greu elw cryn dipyn yn uwch na'r disgwyl ar gyfer Llywodraeth y DU ar draul y rhai sy'n dibynnu ar y cynllun.
When this arrangement was put in place, it was envisaged the UK Government would receive around £2 billion over a twenty-five year period. In fact, I understand that the total return, to all Governments since then from the MPS, has been approximately £4.5 billion, creating a windfall to the UK Government at the expense of those who rely on the Scheme.