Funnily enough ...
I want to get a metric century in before the end of February but I am still getting over a bad cold so I didn't want to commit myself to one long ride so I'd tackle it in two legs. I decided I would do the route in question my usual way and if I still feel okay at the end of it I will go round the roundabout in Todmorden and do it again in the opposite direction!
I wanted to make sure that the route was 50 km or slightly further. It actually turns out to be 52 km so I will do the full route one way and cut out one little climb on the second leg which will reduce that one to 50 km.
If I feel knackered after one leg, I'll rest for a couple of days and then give it another go.