(01 Nov 2018, 11:17 am)Kuyoyo wrote More than likely was being used for route learning combined with type familiarisation before working 13/13A (all 6 vehicles work both routes - 3 work 13s from Salters Lane and 13A from Coulby with the other 3 working 13s from Coulby and 13As from Salters Lane).
You wouldn't need L plates for that.