31111 was withdrawn in 1983 and languished at Swindon for 3 years before scrapping so depends on your definition of mid 80s.
As it is it’s a Hornby lash up …. 31111 retained her raised body side trim until the end which the Hornby blue model lacks … it was only ever paint on the green versions! Most lost that trim when refurbished so that may work to your advantage…. But you can reinstate it with micro strip if repainting
Typing Class 31 skinhead in to a Flickr search will come up with a few…