Many thanks for the information.
I have found an 1866 advert for Browns New Patent Mower that caught the eye of Royalty and was subsequently used at Windsor Castle, Hampton Court, Sandringham and others.
Another mower: In 2013, Zara Phillips MBE was heavily photographed by the press on a restored 1963 John Deere 110 garden tractor at the Chelsea Flower Show on the JD stand. (Cannot put a photo as they all seem to be under copyright).
