The price you pay is decided by the supplier you pick and the state and age of your boiler.
Older or fault-prone boilers are more probably to require longer servicing than newer fashions.
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When the engineer companies your boiler, they may update the Benchmark Service Record to ensure it’s in accordance with Building Regulations and meets your boilers garantee circumstances.

If you find your gas, electrical or combi boiler isn’t producing sufficient heat and the water is tepid or chilly, it’s a transparent signal that there’s a fault which needs quick attention.
Obviously you're looking for leaks normally however the condensate produced by condensing natural gasoline boilers is barely corrosive.
If a condensate lure leaks onto some metallic it's going to corrode it.
If a condensate lure leaks onto some metallic it's going to corrode it.
A service like this shouldn’t cost you greater than £100 – and potentially a little less if you’re based within the North East.