A guarding quote is a wage calculation before it is a price
Very little of a manned guarding rate is discretionary. The wage basis applicable to the skill category and the zone is set by notification, not by the agency. The statutory contributions on top of it are set by law. Leave and holiday entitlements are set by law. Once those are in place, what remains for the agency to decide is a relatively thin band covering supervision, administration, compliance effort, risk and margin.
This is why price comparison in guarding is so often misleading. Two quotations differing by a visible amount per guard per month are frequently not two different margins. They are two different views of whether the statutory build-up will actually be paid, and the client carries a real exposure if the answer turns out to be no. An agency that publishes its build-up is making an argument no amount of assertion can match.
