No overhaul - everything else was as manky as ever: carpets, seat frames, tables, seat back cushions, interior panelling, luggage racks, lighting. But they've replaced the bottom cushions covered in the old style National Express Scotrail upholstery, although brand new clean material, which is why it took me a while to realise. I wondered why I wasn't squirming around on the lumps and bumps as usual.
158726 if anyone's interested. Maybe it had become so bad that they had to come up with a temporary solution.
Anyway, thousands of grateful bottoms thank whoever thought of doing it.