I've been continuing to monitor the rides added to the calendar so far for 2011 (the first starts in early April) - the split on direction is LEJOG 43% and JOGLE 57% - clearly there's a strong belief that JOGLE is downhill!
Reality is that in absolute terms LEJOG is a net downhill ride, the start on the cliffs at Land's End is higher than the finish at John O'Groats which is almost at sea level