Section 270HB | ... UK property businesses and ... overseas property businesses
From legislation.gov.uk
If the qualifying activity of a person who is entitled to an allowance for a chargeable period is—F1
(a)a UK property business, orF1F2
(b)an ... overseas property business,F1F3
the allowance is to be given effect in calculating the profits of that business by treating the allowance as an expense of that business.