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The latter. The cap is the max to be paid by a notional 'average' household, so unit pricing is set to ensure that's not exceeded.
You'll get that unit price, but total cost depends on your actual consumption.
jsabine-
Cool, this is my understanding. Think media often push's the cap like this giant impenetrable price that no one could possibly spent more than. Like how 'car crashs into pedestrians' instead of 'texting driver strikes pedestrians with domestic vehicle'.
Have family with an old farm house, they've done as much as they can short of knocking it down and starting again, they are on heating oil and have the latest gen boiler. If they spend more than £600 a month in winter on heating oil, thats a good month. Their annual heating bill (3 bed farm house + hot water for buildings) not including electric for heating cow barns and all 'farm costs' is routinely in the £4-5.5k bracket. And they aren't afraid of sitting around inside in full gear.
BrickMan
Never had massive bills so no real prior knowledge or worry of 'the cap'
Does 'the cap' mean, no matter your household usage, they will not charge you more than this (sounds too good to be true), or, the probable actual scenario, 'the cap' is the estimate cost given to households based on national average multiplied by max cost per unit allowed by ofgem. Therefore either 1) I can piss gas away all day because they are never going to charge more than £2k a year for it 2) I have strong thoughts on what is considered average.