A manager may invest a sum of money—
(a)from the manager’s capital account only if it is invested—
(i)in the name of the manager, in a heritable security in Scotland or in a security over land in the rest of the United Kingdom,
(ii)in the name of the manager, in an interest-bearing account,
(iii)in an investment of such other description as the Scottish Ministers may specify in a direction under section 37(1),
(b)from the manager’s income account only if it is invested in the name of the manager in an interest-bearing account.