Wells Street is an old route, marking the boundary between former freeholds: the Cavendish–Harley, later Portland and then Howard de Walden estate to the west, and the smaller Berners estate to the east.

By the beginning of the eighteenth century, landuse in Marylebone was by no means purely agricultural. Clay and gravel pits abounded due to London’s encroachment, and a tenant of one of the eastern fields, George Wells, had been called a brickmaker as far back as 1658. Wells Lane or Street, named after him, was another old track, but did not connect with Oxford Street till the 1690s.

George Wells occupied the fields east of the lane, called Newlands, when th...

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Source: Marylebone – The Underground Map