The Motor Rail & Tram Car Co Ltd.... Simplex Trench Locomotive from WW1.
Great effort to display this at the War & Peace Show 2013

the loco & wagon were provided from the Apedale Valley Light Railway in North Staffordshire. Watch out for their own First World War commemoration event in September next year (Tracks to the Trenches - 2014) - heavily focussed on these WW1 light railways! A Google search will find the details....