The Child Support (Maintenance Assessments and Special Cases) Regulations 1992

24.  [F1For each week in which a parent provides] board and lodging accommodation in his home otherwise than as a self-employed earner—

(a)£20.00 of any payment for that accommodation made by[F2, on behalf or in respect of] the person to whom that accommodation is provided; and

(b)where any such payment exceeds £20.00, 50 per centum of the excess.