Thanks Alastair. It?s been done now and (as Pitlamp suggested) makes a very impressive descent which lands you bob-on the top rung of the 1st ladder in Stemple Highway.
We both had a good look on the way down (and up), but all the ways off appear to be along the same line as the rest of the major development in the area, with further shafts in the roof probably going straight up into the floor of Balcombe's Way and windows lower down dropping elsewhere into Stemple Highway. Shortly before the base of the pitch you could also see north-west through into the continuation of the main Stemple Highway tube and see the top of the rope protecting the 2nd ladder pitch, there didn't appear to be anything exciting happening in between. The whole Stemple Highway/Balcombe?s Way area really is like a massive block of Swiss cheese.
We stripped the hangers, as we thought it very unlikely that it would be repeated what with the main RoTV pitch right next door, but left the stainless bolts and nuts in place just in case (they?ve been over-drilled so can be knocked in if need be). If anyone does fancy a look, you?ll need 5 hangers, 1 deviation and a 70m rope and can start the pitch by rigging a large Y from the existing bolts approx. 2/3 of the way along the RoTV traverse.
For the record, the aven above the start of the RoTV traverse is blind after approx. 25-30m and the rope on those 2 short pitches down to Balcombe?s Way is still in good nick.