Thomas Cooke & Sons of York had a number of celebrated of customers.
In 1859 John Couch Adams of the discovery of Neptune fame ordered a universal portable equatorial stand of best construction to carry a telescope of 3.5 inch aperture.
As far as I know the telescope was not a Cooke, but I do not have any further information regarding this telescope. Maybe if he had it in 1846 he could have looked for the planet we now call Neptune!!