The trustees may not authorise a person to exercise any of their asset management functions as their agent except by an agreement which is in or evidenced in writing.
The trustees may not authorise a person to exercise any of their asset management functions as their agent unless—
they have prepared a statement that gives guidance as to how the functions should be exercised ("a policy statement"), and
the agreement under which the agent is to act includes a term to the effect that he will secure compliance with—
the policy statement, or
if the policy statement is revised or replaced under section 22, the revised or replacement policy statement.
The trustees must formulate any guidance given in the policy statement with a view to ensuring that the functions will be exercised in the best interests of the trust.
The policy statement must be in or evidenced in writing.
The asset management functions of trustees are their functions relating to—
the investment of assets subject to the trust,
the acquisition of property which is to be subject to the trust, and
managing property which is subject to the trust and disposing of, or creating or disposing of an interest in, such property.