Power of attorney for less than one year
57If a power of attorney, whether given for valuable consideration or not, is in the instrument creating the power expressed to be irrevocable for a fixed time therein specified, not exceeding one year form the date of the instrument, then in favour of a purchaser,
(a)
the power shall not be revoked, for and during that fixed time, either by anything done by the donor of the power without the concurrence of the donee of the power, or by death, marriage, lunacy, mental incompetency or bankruptcy of the donor of the power,
(b)
any act done within that fixed time by the donee of the power, in pursuance of the power, is as valid as if anything done by the donor of the power without the concurrence of the donee of the power had not been done, or the death, marriage, lunacy, mental incompetency or bankruptcy of the donor of the power had not happened, and
(c)
neither the donee of the power nor the purchaser shall at any time be prejudicially affected by notice either during or after that fixed time of anything done by the donor of the power, during that fixed time, without the concurrence of the donee of the power, or of the death, marriage, lunacy, mental incompetency or bankruptcy of the donor of the power within that fixed time.