(Yesterday, 5:41 pm)Ryland wrote What on earth is the livery in 4504! Are they all going to be like that or they getting the arriva livery
It's route branding? The Luton batch have also been branded, so evidently Arriva are happy to brand specific routes again.
4502/9 at least are fully stickered up with no branding, so it may be that just a few will receive the route branding - unless 4502/9 have been done in error.