When I went to the Coys International Historic Festival meetings at Silverstone in the 1990s there was always a sprinkling of vintage commercial vehicles to be seen in the paddock, and here's one that was there in July 1995.
It's a 1934 Sentinel S4 Steam Wagon, no. 9016, made by Sentinel Waggon Works (1920) Ltd of Shrewsbury, Shropshire. Commercial steam vehicles were popular in the Great Britain from the later years of the 19th century until the mid-1930s though a few continued to be used until the 1960s. I remember seeing one in the centre of Liverpool on a couple of occasions in the 1950s when on my way to race meetings at Aintree.