The first floor gallery hush bar - away from the hubbub of the Grand Cafe below - at imposing Victorian former City bourse, The Royal Exchange, has been rebranded, cosmetically retouched and relaunched by owners D&D as a discreet ‘new’ cocktail bar. The emphasis is on drinks inspired by the father of modern American mixology Jerry Thomas in his indispensable 1862 tome, Bar-tenders Guide. Savvy £12 signatures include a refreshing eucalyptus and kaffir lime Collins; Mexican Couperee ( a tart light vanilla foamed Patrón Añejo, Citronge and Falernum sour), and smoky brass teapot serve, Sauterelle - a vanilla-infused port and cherry liqueur Gin Mare Martini inspired by the Martinez rather than the crème de menthe-based Grasshopper its French name implies. Champagne (from £69 a bottle) and wine by the glass (from £5) are what to order with open sandwiches and small plates such as velvety tuna tartare (£9.50) and juicy Aberdeen Angus beef sliders that work well, where insipid frazzled fried squid (buried under a mound of toasted flakey pointlessness) fails when we visit during Threadneedle's soft launch.