4812/13 have retained the interior for definite as I caught a ride from both of those, and I only caught a glimpse of 4814 but I'm fairly sure it also retained the seat moquette it had previously.I've just had a look at my photo of 4814 and zoomed in and the seats look either really dark blue or black but is difficult to tell as the windows look really dark plus things are reflecting onto the windows, so 4814 may have been done but I'm not 100% on that.
I'll try and see tomorrow.