In a comment to one of the posts on the UK National Lottery scam, Tahani has kindly contributed what you get when sending in £577 for registering your claim. It’s a very phony looking certificate, and then they want £1500 more for your claim to go through with the payment process.
So, if you register (and send in whatever amount the scammers want you to pay for registering for you winnings), and then get a certificate that looks false or altered, it probably is. And this is what Tahani’s certificate looks like (with Tahani’s remarks and comments):
Thanks Tahani for sharing!