Basically there is a single common transmission/distribution system. Every house gets its electricity and gas out of the same common network, and every supplier puts gas and electricity into the same common network. A meter at your house measures how much you take out, and the supplier puts the equivalent amount in (or pays someone else to put it in for them). The connection between you and your specific supplier is notional only. It’s a bit like putting money in the bank. If I deposit some cash at the bank and later take it out, I’m not getting the same actual coins or banknotes out, but what I get out is interchangeable with it.
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