I've got a likely meet at the youth hostel car park. I'd not normally park there myself (if I've driven there). I can't imagine Telegraph road is fun heading south, especially as the predominant traffic will be coming the other way!
From the youth hostel I'd probably be inclined to take the steep descent through the woods into the bottom car park and then back up the fire road. However there will be several "other halves" who are all getting pretty damn good on their bikes but might not appreciate that descent straight off the bat.
So any sensible options for heading from the youth hostel to the top of Holmbury?