Gray over at 'Isn't It About Time We Tried Socialism?' blog espies a mention of the late comrade, Wally Preston, over at Shiraz Socialist.
Wally rejoined the SPGB after his time in the IS/SWP (I understand he was the IS Industrial Organiser for a time in the early seventies), and was a driving force behind the incredibly active Eccles Branch of the SPGB in the 1980s.
His widow, Blanche, is still a stalwart of the SPGB.