7.—Where, by an agreement or arrangement entered into under this or any other Act, a local authority exercise or perform a power, function or duty of another body—
(a) it shall be the duty of every officer of the local authority to perform such duties appropriate to the nature of the power, function or duty as the local authority may decide, and
(b) in case the other body is a local authority, it shall be the duty of every officer of that local authority to refrain from performing such duties appropriate to the nature of the power, function or duty as that local authority may decide.
