"Mollie Gwynne's" have several locations, most central is on Noviy Arbat Street near to   junction with Sadovaya and around the corner from there on Sadovaya is "The London Pub". "Churchills" is not so central, on Leningradskoe Chaussee between Aeroport and Sokol metros (closer to Sokol, I think). Also near to Sokol is Schwarzwald (it's through the big arch at Sokol). And try The Real McCoy as well (near Tsvetnoy Boulevard metro).