Interesting, I will check the toe. Had time this afternoon to check all joints and mounts. Nothing found. Removed 5mm spacers (reqd for Dunlops to clear struts) and ran car on Yokos up the road again. Small shake experienced, slowed down, then accelerated through it holding wheel very firmly in case. Rest of journey perfect, until after slowing down for junction and then accelerating, severe shake again!!! Grrrr........
Will also have that set of wheels rebalanced, just to be certain.