BG procedures call the annual service a "generic service". FGA, case off, visual inspection, gas rate OR burner pressure. It takes as long to complete laptop forms as it does to "service" the boiler.
The "BG" guy was very possibly a contractor. They wear the same uniform, have the same toolbox and, if they agree to take deduction from their job rate, the same van.
The punter pays upwards from about £14 per month, the cheaper plans carrying a £49/£99 excess. (Why would you pay a few hundred every year to have access to a NG guy then pay £99?!!).
The contractor (certainly last year) gets paid the HUGE rate of £20.02. This includes travel time, diesel van expenses, insurance, down time, time waiting for the laptop to receive the jobs and all the other business costs. He is not going to spend any more time than he has to.