Likely a reference to the White Hart Inn, located in Church End, Willesden, in the modern borough of Barnet in London. For more information about lost inns of London, see: https://www.layersoflondon.org/map/records/white-hart-inn

In London Labour and the London Poor:

Of the Blind Street-sellers of Tailors’ Needles, etc. (Volume 1) [as "Old White Hart"]