SlowBurn sits on a stretch of Walthamstow that's more grit than glamour - opposite a funeral care centre and next to a petrol garage - but that's kind of the point. This part of E17's got character, and behind the corrugated steel doors of Blackhorse Lane Ateliers, you'll find a restaurant that shares space with a working jeans atelier - and yep, you're quite literally sliding past spools of fabric before you reach your table.