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Black and Blue
For something more red-blooded, try Black And Blue, the chilled-out steakhouse chain with branches in Belsize Park, Borough Market, Kensington, Wigmore Street and Gloucester Road. The côte de boeuf for two to share costs £25, so won't see you out of pocket. No reservations are being taken at all, so it's try your luck time.
blackandbluerestaurants.com