(1)This section applies in computing, for the purposes of Case I or Case IIof Schedule D, the profits or gains of a trade, profession or vocation carriedon by an individual or by a partnership of individuals.
(2)In a case where this section applies, nothing in section 74(a) or (b) ofthe Taxes Act 1988 (deductions limited by reference to purposes of trade etc.)shall prevent the deduction of a sum in respect of expenditure incurred inconnection with the provision for or use by the individual, or any of theindividuals, of a security asset or security service.
(3)Subsection (2) above shall not apply unless the asset or service isprovided or used to meet a threat which—
(a)is a special threat to the individual’s personal physical security, and
(b)arises wholly or mainly by virtue of the particular trade, profession orvocation concerned.
(4)Subsection (2) above shall not apply unless the person incurring theexpenditure has as his sole object in doing so the meeting of that threat.
(5)Subsection (2) above shall not apply in the case of a service unless thebenefit resulting to the individual consists wholly or mainly of animprovement of his personal physical security.
(6)Subsection (2) above shall not apply in the case of an asset unless theperson incurring the expenditure intends the asset to be used solely toimprove personal physical security.
(7)But in a case where—
(a)apart from subsection (6) above, subsection (2) above would apply in thecase of an asset, and
(b)the person incurring the expenditure intends the asset to be used partlyto improve personal physical security,
subsection (2) shall nevertheless apply, but only as regards theappropriate proportion of the expenditure there mentioned.
(8)For the purposes of subsection (7) above the appropriate proportion of theexpenditure mentioned in subsection (2) above is such proportion of thatexpenditure as is attributable to the intention of the person incurring itthat the asset be used to improve personal physical security.