Just been musing over this all - what age is Peggy? over 90, I think. Tom seemed to suggest a few days ago it could be years till he gets 'his' dosh. How many folk get to years over 90? - so it could all happen quite soon.
Also, Rob is renting at present. Why won't he and Helen and the Wunderkind not just move into the Lodge when the moment comes?
I was thinking the same as someone above about Helen's super-fertility - one flash of a turkey baster and she was preggers before, so why isn't she already pg again? I can't imagine that pair are diligent with contraception.