Took the advice of "legs up the wall" .....
Drank a heap of water Thursday night and spun for the first 20kms up through the Gorge Rd.........
Got to the end after riding to the start and riding back to the car, approx 145kms and felt fresh .. in hindsight probably could have gone a bit harder on the ride but finished what I, and no doubt thousands of others, had set out to do and as for one of the posters comments, that felt great. Legs no dramas at the end.
Thanks for all the advice...... nice to have a post with no "dramas" attached.