I do agree, as a frequent traveller on the 1995TS, I have noticed general floor cleanliness being an issue especially. However the units have been extremely intensely worked with the SeTrac ATO essentially from their last interior refurbishment in 2013. Ten years without any interior refreshments in hard going for any train, let alone Tube Rolling Stock!. On the other hand, said units have always suffered from interior aliments in some shape or another from pretty much their introduction, remember the bobbly flooring and the loosely hanging car end seals prior to their 2013 refurbishment. However what was diabolical, was the exterior of the units (Pre Referb) large quantities of graffiti and just general dust build up. It makes me wonder that their PFI contract with Alstom was possibly less glamorous than anticipated and still continues. Meanwhile the 1996TS was financed by Alstom as "Cheapest First Cost" which essentially meant that once they all entered service, Alstom would be out of the picture in at least a less exaggerated manor. It is clear to see that theirs was favourable, as although the units have witnessed some degree of interior wear and tear, it has been noting compared to their sisters on the Northern!