Can you use a dummy address or a friend’s address in another country and/or sign up via a VPN to mask your location? There are companies that will open and scan your mail and make it available online so it could be a real address. But they are a little pricey. It’s likely due to UK laws not the provider themselves, so probably all reputable providers (that follow the law) may require it.

It’s why I always buy physical games whenever possible regardless of platform. And I never buy games that require an online connection to play single player. It’s less convenient to switch cards/discs between games, but it’s worth it to be able to keep the games long term as well as the small resale value being a bonus.