> Does anyone know if the old Airfix "blue circle cement" 12 ton van was
> fictitious or based on an actual wagon?
Fictitious.
To the best of my knowledge, Blue Circle liveried vans were the pre-war
Iron Mink type which survived well into the BR period as depicted by
the Ratio kit; and the 1960s vintage Palvan; see
http://gallery6801.fotopic.net/c125427.html
John Isherwood.