Tipit, the eight wheeler DUT 170K is certainly unusual and as far as I know was one of a kind.
I presume that somebody like Primrose did the conversion.
It was probably used on Ibstock block delivery or similar from the Leicester area.
It later wound up with NH Huggins & Sons from Whaplode in Lincs where it was painted maroon & blue and where it was fitted with the later style plastic grille.
It did the rounds at the early HCVC shows in the early 1980s.
Huggins finished a while back as far as I know, so who knows where it is now.
Cheers
Mark