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Collected more measurements from the A1134, Malting Lane, Ridley Hall Road, Newnham Walk, and Sidgwick Avenue on 24th Feb 2019. Confirms location on/near Granta pub.

In reality, and on the Google aerial view, can see a white pole on the north side of the Granta Pub building which then protrudes above the roof-line and looks like it could well be a base station antenna.