Had to look this one up. Daimler single-decker. There were Fleetlines with single-deck bodies ...not very numerous... but this appeared to have a high floor, as though to rise over a rear underfloor engine, making it, I thought, a Roadliner ...also uncommon. To Bus Lists On The Web, which gave it as a Daimler SRG6LX. Daimlers aren't really my Specialised Subject, but Fleetlines were CRG I remembered. To David Kaye's handy Buses and Trolleybuses Since 1945. Yes, the Roadliner was first shown at Earls Court in 1964, as the SRC6, signifying Single-deck, Rear Cummins 6-cylinder engine. The engine was a V-type ...not the sort of thing that would have gone down well in the workshops and inspection pits of the nation's bus operators. Mr Kaye's book was published in 1968: it appears that by 1970, when the vehicle in the photograph was new, a Gardner engine option was being offered in an attempt to propitiate the industry's chief engineers. The photo was taken in Dundee on Tuesday 26th June 1979.