Vic Berry Scammell S26 E727BRG at the Leicester yard in the late 1980s with a London Underground driving motor car that had seen better days. (Merfyn Jones)

Mike Przyrembel writes ... That is the one converted by Derek Parnaby and sold at his auction in the late '80s. I never understood the logic behind the conversion as the 14-litre Cummins was a standard offering by Scammell and fitted without the snout; it was later sold on to Allelys and re-built with a flat front. Although the SOMA rear axles appear heavy duty they were only rated at 12T each making it unsuitable for STGO3 work where 16T per axle is the norm.