The Gunmakers (ex-William Wallace), Marylebone
The staff are friendly, and the locals eccentric - a small selection on the pumps, but all the usual beers/lagers are there and they are well kept.
If you find your feet are aching from too much shopping on Oxford Street, this little gem is well worth the walk a little further from the bustle.
33 Aybrook Street, Marylebone, London, W1U 4AP
Leave Baker Street tube station and head down Baker Street until you get to Paddington Street (2nd Left). Turn along Paddington Street then turn right down Ashland Place (just past the school yard). Follow Ashland Place down to Moxon Street, take the 1st right into Aybrook Street and you'll see the pub on your right. From Bond Street: head up James Street, which then becomes, Thayer Street and turn left along Blandford Street. Aybrook Street is on your right and you'll see the pub about halfway along the street.