It's good to see the pictures of this. I had no issue with the old livery - it was the increasingly tatty standard of the interior that frustrated me - after all when I buy a ticket what I'm buying is somewhere pleasant to be for the duration of the trip, so it's good to see this work finally underway.
I do think its a retrograde step removing 1st class on these routes however. Reduces passenger choice and presumably is a nuisance on parts of the route like Derby to Birmingham where other parts of the fleet have 1st class provision. rather too much of the chipping away of quality provision that we have seen across various pats of the network, and certainly on XC.
Having recently read about this I used one of the declassified 1st class compartments on an xc 170 yesterday. It's been fully debranded and the doors to the compartment switched out of use and permanently open.
Are they still offering a trolley service on certain XC operated 170 services?