Fiduciary in UK Law
Bristol and West Building Society v Mothew
The expression "fiduciary duty" is properly confined to those duties which are peculiar to fiduciaries and the breach of which attracts legal consequences differing from those consequent upon to the breach of other duties. Unless the expression is so limited it is lacking in practical utility. In this sense it is obvious that not every breach of duty by a fiduciary is a breach of fiduciary duty.
A fiduciary is someone who has undertaken to act for or on behalf of another in a particular matter in circumstances which give rise to a relationship of trust and confidence. A fiduciary must act in good faith; he must not make a profit out of his trust; he must not place himself in a position where his duty and his interest may conflict; he may not act for his own benefit or the benefit of a third person without the informed consent of his principal.
The nature of the obligation determines the nature of the breach. The various obligations of a fiduciary merely reflect different aspects of his core duties of loyalty and fidelity. Breach of fiduciary obligation, therefore, connotes disloyalty or infidelity. Mere incompetence is not enough. A servant who loyally does his incompetent best for his master is not unfaithful and is not guilty of a breach of fiduciary duty.
Conduct which is in breach of this duty need not be dishonest but it must be intentional. An unconscious omission which happens to benefit one principal at the expense of the other does not constitute a breach of fiduciary duty, though it may constitute a breach of the duty of skill and care.
Bristol and West Building Society v Mothew
Equitable compensation for breach of the duty of skill and care resembles common law damages in that it is awarded by way of compensation to the plaintiff for his loss. There is no reason in principle why the common law rules of causation, remoteness of damage and measure of damages should not be applied by analogy in such a case.
A fiduciary who acts for two principals with potentially conflicting interests without the informed consent of both is in breach of the obligation of undivided loyalty; he puts himself in a position where his duty to one principal may conflict with his duty to the other: see Clark Boyce v Mouat  1 AC 428 and the cases there cited. Breach of the rule automatically constitutes a breach of fiduciary duty. But this is not something of which the Society can complain.
Arklow Investments Ltd and Another v I.D. MacLean
In the present context, the concept encaptures a situation where one person is in a relationship with another which gives rise to a legitimate expectation, which equity will recognise, that the fiduciary will not utilise his or her position in such a way which is adverse to the interests of the principal. The existence and the extent of the duty will be governed by the particular circumstances.
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