Yeah, looking at Yeadon's, Hull Botanic Gardens had a decent sized allocation right the way through the BR steam period. None of them seem to have spent much time in one place at other NER sheds. Apart from 67772 (22/11/48 - 19/11/61), 67750 (09/12/48 - 03/12/61) and
67777 (21/01/50 - 19/11/61) at Darlington, the rest seem to have been moved every few months or so. 67735 spent its entire career at Stratford.Looking at the repair histories, the class seems to have suffered from dodgy tanks.