This section applies for the purposes of this Part.
Subsections (4) and (5) apply if the land is in an area for which there is both a district planning authority and a county planning authority.
If any of the relevant development is the construction or alteration of a hazardous waste facility within section 14(1)(p), the relevant local planning authority is the county planning authority.
In any other case, the relevant local planning authority is the district planning authority.
"The relevant development" is—
if the relevant offence is an offence under section 160 or 161(1)(a), the development referred to in section 160(1) or 161(1)(a);
if the relevant offence is an offence under section 161(1)(b), the development to which the order granting development consent mentioned in section 161(1)(b) relates.
"The relevant offence" is the offence by reference to which a provision of this Part confers a function on a local planning authority.