Many thanks for the information doodles - very useful. I found the timetable and it looks like the journey may be around an hour from Badgers' Mount to Skinners'. Also I would need to drive to Badgers' Mount - that's 10 mins or so.
As I work full time in London, I think it would be easier to go to Orpington station with ds so he gets the 7:39am but I'm not sure if he should get off at High Brooms (quiet road, uphill etc), or at Tunbridge Wells (walk or hop on a bus etc). I think 30 mins on a train is more comfortable than an hour on a bus - although I don't suppose my ds would notice any difference anyway...
I'm looking to see if there are other boys from Orpington who does this commute
Tunbridge Wells is probably a better bet on a day to day basis, there will be loads of lads making the walk plus if the weather is foul it's easy to hop on a bus upto school from outside of the station. On games days when they are at Southfields they tend to walk down to High Brooms as it's very close.
Hope he enjoys it, my lads are in Yrs 11 and 8 and are very happy there.