inamuckingfuddle - I've just spoken to my Dad, he lives in Oughtibridge, apparently your Dad would have problems getting to the M1 his normal route because the A61 near Greno woods is still closed.
My first thought was to go through from Hillsborough to Oughtibridge, then Deepcar, pick up the A616 and get onto the M1 from there. Deepcar was flooded yesterday, but looking at the traffic news I can't see it mentioned now so it might be alright.
If Deepcar is still impassible Dad says the best way is going up to Grenoside via Oughtibridge (still difficult as some of the road between Middlewood and Oughtibridge has collapsed into the Don so there's only 1 lane open.) Then from Grenoside head to Wortley, then Penistone and get on the M1 there.
It's a convoluted route, and he'll probably need a good map reader but it'll keep him on the higher ground and avoid the areas still flooded.
Good luck either way.
Sorry to hear some of you have been affected, my parents are quite a way up the hill so no flooding at their house although the village has been quite badly hit. Their power went off at about midday yesterday though. They've been told if it doesn't come on at about 11 tonight then it'll be another 3-4 days.