At Spaniards End, Hampstead you can find the 17th Century Spaniards Inn and toll house. As you can see, the gap between is only wide enough for one car at a time, so in rush hours this piece of road becomes badly congested. As both buildings are listed, nothing can be done.
Dick Turpin the highwayman was reputed to have been born in the Inn, and stabled his horse in the toll house. There is also a tenuous but fascinating connection between this place and Berkley Square (two days ago). I'll post the answer in comments during the day.
See where on the London Daily Photo Map