The Winchester Tavern is supposed to be in North London, but the exterior was that of the Duke of Albany in Lewisham, at the junction of Monson Road and Barlborough Street.
The Duke of Albany has now been converted into flats:
The Winchester was based on the Shepherds Tavern, a pub at 312 Archway Road, N.6. It has now become the Boogaloo:
Above, iIn his book Nerd Do Well: a Small Boy's Journey to Becoming a Big Kid (2011), Simon Pegg explains the importance of this pub, and debunks the commonly held belief, in North London, that the Winchester in Shaun of the Dead was based on the pub called the Winchester further down the Archway Road, at no. 206: