In regards to the Penicuik corridor topic, I think the 15 being extended is the best option. I would have it following the current route to Gowkley Moss, then serve Auchendinny, along passed the high school, turn right and go up the hill on Mauricewood road, left onto Silurian road, then right following the 37 Silverknowes bound through Deanburn, terminate at penucuick town centre, then operating back the main road then up the hill passed Deanburn turning circle then back onto Silurian road. This route isn't ideal, I would've had it so a reverse and go back the same way rather than doing a loop around Penicuik if it were possible to turn around at Penicuik town centre from this direction