That didn't quite go to plan. Turns out the added-on section - from Durdle Dor to Lulworth Cove, via Oswald Bay - is steeper and more perilous than the early stage. By the time I reached Lulworth and the agreed rendezvous with Mrs S I was battered, drenched in sweat and ready to join the dogs in the back of the car for the return leg.
Over 500 metres of elevation in a shade over nine kilometres, much of it virtually vertical. Jesus wept, my legs were shredded, lungs in tatters, Vermilion Almeria top rancid.. Here's a shot of me just over halfway. It's a genuine selfie - this is how much those climbs hurt.
So I wimped out, but not before putting in a decent effort. Thanks to my inability to post more than one picture via iPad I'll chuck the elevation map in a new post below. For those with access to The Fleecebook,
here's a link to more photos. It really is a stunning part of the world.