(1) Where a trust for sale or a power of sale of property is vested in a trustee, he may sell or concur with any other person in selling all or any part of the property, either subject to prior charges or not, and either together or in lots, by public auction or by private contract, subject to any such conditions respecting title or evidence of title or other matter as the trustee thinks fit, with power to vary any contract for sale, and to buy in at any auction, or to rescind any contract for sale and to resell, without being answerable for any loss.