(1) A building society shall secure that the difference between -
(a) the value of X on any quarter day; and
(b) the value of Y on that day or the value of Y on the immediately preceding quarter day, whichever is the greater,
does not exceed 50 per cent of that value of X.
(2) For the purposes of subsection (1) above -
X = the aggregate of the following, namely -
(a) the principal value of, and interest accrued on, shares in the society;
(b) the principal of, and interest accrued on, sums deposited with the society or any subsidiary undertaking of the society; and
(c) the principal value of, and interest accrued under, bills of exchange, instruments or agreements creating or acknowledging indebtedness and accepted, made, issued or entered into by the society or any such undertaking; and
Y = the principal value of, and interest accrued on, shares in the society held by individuals otherwise than as bare trustees (or, in Scotland, simple trustees) for bodies corporate or for persons who
…