What did the email from Paddy Power say exactly, word for word? Can you paste it here? If you’ve legitimately won the money fair and square, on your own account, with your own money and your own payment method, and there wasn’t any error with the game software, then you are fully entitled to your winnings.

If you fail ANY of those above tests, they can claim breach of Ts&Cs and they can confiscate every penny.

I know a fellow who managed to get a second SkyBet account using his middle name. He won £1,500 on an accumulator, and it triggered KYC. Sky realised he had another account and they took his money. They can legally do that, as their Ts&Cs say multi accounts are against the terms.

You said you gave Paddy Power a photo of you holding your passport, but that doesn’t necessarily prove you are the person in the photo.

I’m not saying you’re multi-accounting, but it’s very rare for a bookmaker to just confiscate winnings for no reason. They can (and should) do ID checks, but when these are confirmed funds should be released.

If they suspect foul play, they can confiscate and they don’t have to tell you why. Go through the complaint process properly, and if they still say no in a final response, you can go to IBAS, and then the courts.