How do I bathroom / kitchen / extension? etc.

Hypothetical at this stage but uncollected goods /Torts act... As an involuntary bailee who has tried to trace the bailor / given notice of intended sale of their equipment - if I were to sell the tools and owe that money to the bailor less costs, what are reasonable costs? Especially if the job is 50% finished and I've paid for 75% of it? And if I can't trace the bailor to give any money to, what happens to the money then?

Bailee’s power of sale.
(1)This section applies to goods in the possession or under the control of a bailee where—
(a)the bailor is in breach of an obligation to take delivery of the goods or, if the terms of the bailment so provide, to give directions as to their delivery, or
(b)the bailee could impose such an obligation by giving notice to the bailor, but is unable to trace or communicate with the bailor, or
(c)the bailee can reasonably expect to be relieved of any duty to safeguard the goods on giving notice to the bailor, but is unable to trace or communicate with the bailor.
(2)In the cases of Part I of Schedule 1 to this Act a bailee may, for the purposes of subsection (1), impose an obligation on the bailor to take delivery of the goods, or as the case may be to give directions as to their delivery, and in those cases the said Part I sets out the method of notification.
(3)If the bailee—
(a)has in accordance with Part II of Schedule 1 to this Act given notice to the bailor of his intention to sell the goods under this subsection, or
(b)has failed to trace or communicate with the bailor with a view to giving him such a notice, after having taken reasonable steps for the purpose,and is reasonably satisfied that the bailor owns the goods, he shall be entitled, as against the bailor, to sell the goods.
(4)Where subsection (3) applies but the bailor did not in fact own the goods, a sale under this section, or under section 13, shall not give a good title as against the owner, or as against a person claiming under the owner.
(5)A bailee exercising his powers under subsection (3) shall be liable to account to the bailor for the proceeds of sale, less any costs of sale, and—
(a)the account shall be taken on the footing that the bailee should have adopted the best method of sale reasonably available in the circumstances, and
(b)where subsection (3)(a) applies, any sum payable in respect of the goods by the bailor to the bailee which accrued due before the bailee gave notice of intention to sell the goods shall be deductible from the proceeds of sale.
(6)A sale duly made under this section gives a good title to the purchaser as against the bailor.
(7)In this section, section 13, and Schedule 1 to this Act,
(a)“ bailor” and “ bailee” include their respective successors in title, and
(b)references to what is payable, paid or due to the bailee in respect of the goods include references to what would be payable by the bailor to the bailee as a condition of delivery of the goods at the relevant time.
(8)This section, and Schedule 1 to this Act, have effect subject to the terms of the bailment.
(9)This section shall not apply where the goods were bailed before the commencement of this Act.