No member of a police force may be employed by a fire and rescue authority or a relevant chief constable for the purpose of—
extinguishing fires, or
protecting life and property in the event of fires.
Subsection (1) does not prevent the exercise of functions under section 7 (fire-fighting) by—
a relevant chief constable, or
a deputy chief constable to whom such functions have been delegated by a relevant chief constable.
In this section "relevant chief constable" means the chief constable of a police force for a police area to whom —
functions of a fire and rescue authority have been delegated under an order under section 4H, or
functions of a fire and rescue authority which are exercisable by the mayor of a combined authority have been delegated under an order under section 107EA(2) of the Local Democracy, Economic Development and Construction Act 2009.