On the matter of Great Grandparents and politics, it always amuses me to recall that Grandad's parents (DMA, ILP and Primitive Methodist) will both have voted against Anthony Eden when he stood at Spennymoor in 1922 and produced some of the most ill-advised leaflets in the history of British election literature: he stressed that he personally knew most of the major coal-owners in the area, apparently quite unaware that this came across as a ham-fisted threat!
My great-great-grandfather worked at Spennymoor before finally moving up to Tyneside. Around twenty years before then though.