If an act to which section 5 applies involves expenditure, it is lawful for D—
to pledge P's credit for the purpose of the expenditure, and
to apply money in P's possession for meeting the expenditure.
If the expenditure is borne for P by D, it is lawful for D—
to reimburse himself out of money in P's possession, or
to be otherwise indemnified by P.
Subsections (1) and (2) do not affect any power under which (apart from those subsections) a person—
has lawful control of P's money or other property, and
has power to spend money for P's benefit.