(01 Feb 2016, 9:40 am)BusLoverMum wrote Probably the most sensible bit of speculation yet!
Basically, quite old and tired buses will replace the ones that are either even older, more tired or just plain unsuitable.
Fast cats does need an upgrade, but there's nothing in this current batch of cascades that would make a significant difference. I'm also struggling to think of any all single deck brands that could feasibly cascade into it. It's one of the few that hasn't had an overhaul already in the past year. Most of the ones that haven't have buses at least as old and tired.
Another option for GNE could be:
The Scania's could go to Percy Main for the 17 with another 10 remaining at Deptford for 33/33A/39 meaning they can finally brand it.
The rest replacing older buses in the fleet.