Aha, my local sub! Been up there many times, both from the Earn car park (mostly when we lived for 3 months last year in Bridge of Earn) and also from the Tay car park (my usual ascent route from the Perth side). Still never posted a report yet though
! The Earn side is longer but with better views once you get beyond the initial tree line lower down.....and if you can manage to dodge the dog turds littering the track up and not pay too much attention to the bits that are scarred by tree felling. The Tay car park on the other side is relatively new - you get into it by turning off the Edinburgh road when entering/leaving Perth onto the minor road signposted for Rhynd and Elcho Castle. You used to have to park by the side of the road and tended to get stroppy messages left on your windscreen by Victor Meldrew in the house at the bottom of the track up.