Michelin starred Lumiere is Cheltenham’s worst-kept secret in the best possible way: a tiny dining room with huge intent, powered by a 3.5-acre garden, beehives and a four-day week. Co-owners Helen & Jon Howe talk to The Knife about ankle-break recovery, why honey madeleines tell a bigger story, mentoring tomorrow’s chefs – and how a Tequila Slammer became fine dining’s most joyful palate cleanser.