Some Old Seddon's

Just to bump up this thread here is a rarity, a Seddon SD8 bulk flour tanker before painting into its livery in 1964. The photograph was in a pile of Spillers Milling photos, but was it a Spillers Milling vehicle? Certain aspects of it, such as the rear mudguards are typical Spillers shape, as is the centre mounted ladder. Any information about this rarity would be very welcome.