You got no chance mate and I look forward to seeing you fail.
I doubt I will get the satisfaction of putting my questions to BG management in the County Court - the reason being that their legal advisers will tell them to settle the matter out of court.
Which will mean I have won a personal battle, but it will mean I am unable to do anything to further the case for the general good of people who take all that BG tell them at face value.
I may well forward the papers to one of the TV consumer protection programs whatever the outcome, but having a court judgement in my favour to support the facts would be a great help in getting them to run with it in a program.
My advise to any consumer considering paying BG for a service or a repair is to request full written details of the work that will be charged for, and to get at least two other quotes from suitably qualified engineers so that a comparison can be made.
Also, to anyone paying BG to service their boiler, I suggest they familiarise themselves with what the manufacturer's say should be done during a service, and to watch the BG engineer to see if such maintenance is actually carried out.
A test is not the same thing as servicing a piece of equipment to maintain it in good work order.
No one with any mechanical knowledge would ever suggest that an MOT on a vehicle is the same thing as a Service, i.e. checking something doesn't change the basic condition of it.
A test might be carried out as part of a service, but that's a different matter, e.g. the emissions test on a vehicle MOT does not mean that the vehicle has been serviced, and no one with any sense would ever suggest that it does.
Similarly, a visual inspection of machinery does not change the condition of that piece of equipment, i.e. it might be part of a service, but it is not an act of maintenance that will restore equipment to full working order.
The above are basic concepts, and all anyone needs to do to check that they are getting a Service as defined by the manufacturer of their boiler is the boiler handbook and service schedule, and to watch what the engineer does, i.e. is the front cover of the boiler removed, and are the main components as described in the manufacturer's service schedule dismantled, checked, and cleaned.
Most customers won't be able to tell whether the service has been carried out competently, but they will be able to see whether the basic procedures have been followed.