like the 'new' shunter, the Pressed Steel car body factory in Swindon had 6 which look similar, IIRC they were Fowler diesels, the factory now does body pressing for the BMW Mini rahge, not sure if the shunters are still working.
just found this -------
some have a new home not far from their original place of work, http://www.swindon-cricklade-railway.org/pix2.php#top
the 5th photo on the link.