Let's take this morning's peak, electricity wholesale spot prices were £600 per MWh. A "subsidised" wind farm in the North Sea might be paid £150 per MWh, which ordinarily is indeed very expensive, but right now that means £450 per MWh comes to the government as the other side of the "subsidy".
There's maybe 13GW of wind power this morning (of maybe 35GW used in Britain). If that was all gas power instead, it would have cost us almost £1M every ten minutes extra on top of what will be on bills anyway.
Even at "normal" prices recently, those wind farms are basically free. Only in the middle of the night when there's no power need and the reservoirs and batteries are full do they drive prices briefly negative and thus their subsidy actually pays them, all day the prices are above subsidy levels and they pay us.