Illustrative example
Leaseholders in a small block receive a demand described as a fixed annual estate charge. It has risen by a third in two years. The freeholder says that because it is fixed, none of the leaseholder protections apply to it.
Section 18 is the gate: sections 19, 20, 20B and 27A only reach an amount that is a service charge as defined, and there are two limbs. The first - payable by a tenant of a dwelling for services, repairs, maintenance, improvements, insurance or management - is usually satisfied. The fact everything turns on is the second: whether the whole or part of the amount varies or is capable of varying according to the relevant costs. A label like 'estate charge' does not decide it; what the lease actually provides does.
The freeholder produces the lease clause and the last three years' expenditure figures within a month, and both sides agree to treat the charge as within the statutory regime if the figures show it moving with cost.