Is there a comparison of how many years apart refits took place on different classes after privatisation?
For example with the Class 800s being about 5 years old, how long until there's the chance of replacing the ironing boards?
The seat frame isn't the problem, they just need a better cushion. It (tentatively)
appears TfW have fitted such better cushions on their Sophias, if this has worked I hope that once we've got the present cuts-led Government out of the way they can potentially be fitted to other 80x too.
Speaking more generally, a key reason for replacing older 1970s and 1980s seat designs was that they were dangerous in collisions, with the plastic backs breaking into sharp pieces which injured people. The IC70 was particularly bad for this, though some do still lurk e.g. on Chiltern LHCS. Most newer designs appear to be metal-backed and so won't suffer this issue. Plus some older designs were very space-inefficient - the 76 seat Mk3 layout for instance has terrible legroom despite actually being quite generously spaced.