LEON is celebrating its 20th birthday with the launch of a revolutionary new dish — the gluten-free Lucky Katsu Curry, the first of its kind on the UK high street. To mark this milestone, LEON is hosting a one-night-only pop-up event: The Lucky Katsino. It’s set to be the luckiest casino in town, packed with exciting games and prizes, a magician with a bag full of lucky tricks, a Katsu…