Thanks Clive & Fat Controller
Thanks chaps for commenting on the tank wagons in Chris picture of 2 x Cl 15 at Bury St Edmunds in 1968 . I suspect FC you may well be right as the Carless refinery had open at Harwich in 1964 see attached link for shot of some old MP and a 1960's Carless lorry. http://fueloilnews.co.uk/2014/06/a-golden-moment-for-hcs-harwich-refinery/
Thanks to Chris for the thread.
kr
Keith