This heavily cropped and enhanced image clearly shows the Westminster Bank on Chiswick Roundabout in about 1960 just after the Flyover had been opened by Jayne Mansfield.
Of interest, in addition to the isolated location of the Bank is the old transort cafe called Jock's Box with it's lorry parking facililty. At the foot of the image is the Esso Garage.
The image is linked to an article on the Middlesex County website by Patrick Mathews.