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petercj
It's a gamble which obviously pays off, for every Job that costs more than £99 there will be 2 jobs that costs nothing. You have to be an energy customer and a lot of these customer decide to join up on a service and repair contract, so it's a way of growing the business.
When I said earlier that the £99 was part of a service and repair contract you said it wasn't - post 44 - now you're admitting that it's 'energy customers' who: "join up on a service and repair contract".
The £99 is an excess payment, not a one off charge.
The one off-deal is from £79, including parts and labour - which just means that charges start at £79, so it could be £400 including parts and labour based on a fixed quote. Which is what most companies do anyway, its just that BG dress it up to sound like a deal.
God knows who does the marketing for BG - but Jay from The Inbetweeners wouldn't be a bad guess.