Conveniently located a few yards from Covent Garden, The Langley is a place to meet up before a date or a night on the tiles - you'll only end up lingering here if you're really lazy, quite drunk, or too engrossed to move.
Expect commercial dance music, plush decor, weak cocktails, cheap but nasty food, and wildly variable service. The cool entryway down a side alley in a really busy part of town might impress a date with your knowledge of London's backstreets, but don't ruin the impression by staying for more than one drink.