Quaglino's
An iconic St James's restaurant that has been visited by the likes of Evelyn Waugh and the Queen over the years, Quaglino's is a luxury spot for boozy roasts. It's filled with dark red and gold decor, with a striking central bar and plush velvet booths running along the walls.
Their Sunday lunch menu costs £45 for two courses, or £49 for three, and you can add on bottomless prosecco for £35 extra. Switch to Champagne for a truly elegant experience, as you tuck into roast chicken supreme, aged ribeye, Yorkshire puddings and duck fat potatoes.