That was a given from the absolute get go. Absolutely no question about it.
The pool of 170s EMR received from ScotRail have interiors that have been relatively untouched since 1998, and are probably the most bombsighted interiors on any UK rolling stock in passenger service at the moment in terms of how it has degraded over time. ScotRail effectively gave up on replacing the interior decor of these few units when Abellio came in, in anticipation of their now botched transfer to convert to 171s for Southern. Thus they weren't penned in for the last round of 170 refurbishments that its subclass (401-424) had been the last to recieve, and have resultantly been rotting away ever since.
Pretty sure there's still old NXSR logos inscribed on them, as well as a mixture of old NX & current Saltire branded flooring, and SPT seat covers that were lying around spare to patch up a few seats here and there.