Well, it’s free money if you win. 🙂
Just register at http://freepostcodelottery.com/?ref=90563 with your (UK) postcode, and then check the site daily to see if you’ve won.
It’s that easy.
They don’t spam you, and it’s free to register. They only request that if you use an ad blocker that you consider disabling it for their site — because the prize money comes from the ads run on their site. They try to prevent the “bad” ads, so you shouldn’t ever see any pop-ups or scams there.
I’ve been checking my postcode for over 18 months now. I haven’t won yet, but there’s always tomorrow!