An update, I've got a Terry Gellissimo saddle on the bike as a temporary fix. Mel from Tandem's East swapped this one for me when we were in to set-up the Drag Brake and to do a sort of 500 mile check-up. Not sure if this saddle is a unisex design or what, can't find much information on it. It is a little better but not great so I'm reading and looking into saddle design etc. I'm thinking the John Cobb saddles might be the direction I'll go but need a little more time and information. My Stoker, and dear wife, Rachel is thinking saddle too so were are in conversation each ride about our saddle interface. :-) Seeing the John Cobb set-up in the DubT team bike is interesting.