Could they be mallard seats? and after it goes to lincoln, could it go to some depot to have a few seats refitted every night. I guess it has an NXEC Power car on one end whilst the EMT one is having its engine changed and new paint?
It would be alot easier if they just kept the original seats which are more comfortable than the mallard seats. All they need to do is to give the carriages a refresh in the mallard colour scheme
It's all a matter of opinion and taste: I personally think East Coasts' "Mallard" seats are excellent, I usually use East Coast on journeys of an hour to an hour and a half and experience no ill effects in terms of comfort.