65. No part of a student's covenant income or grant income shall be disregarded under paragraph 15 of Schedule 9 (charitable and voluntary payments) and any other income shall only be disregarded thereunder if, and to the extent that, the amount disregarded under regulation 63(2)(b) (calculation of covenant income where a contribution is assessed) or, as the case may be, 64(1)(c) (calculation of covenant income where no grant income or no contribution is assessed) is less than £5.