First off, proper glad you asked about UK-only casinos because half the sites out there are dodgy offshore operations that’ll nick your money. Been in this game for years and I can tell you Monster Casino is actually decent for a £5 no deposit bonus you just need to verify your age and you’re sorted. BUT and this is a massive but, don’t expect miracles from no deposit bonuses mate. Most of them have wagering requirements. I’ve seen 35x, 40x, even 50x wagering on some of these deals. That means if you get £5 free, you need to wager £250 before you can withdraw anything. It’s mental really. And don’t get me started on the game restrictions usually stuck playing some rubbish slots that nobody wants to touch with a barge pole. Still, if you’re proper skint and just want a flutter without risking your own cash, it’s better than nothing I suppose.