Yes, most people will be aware Arriva own TGM and the influx of Arriva vehicles from other areas after the Tall Ships which ended up staying in the region.

The vehicles which are ex-Arriva and based at Annfield Plain such as the Alx400's have all been painted in Classic/TGM colours as far as Im aware.
This one hasnt been repainted and I have never seen it operating a Classic/TGM route before, hence why I posted.

On having a quick search of the internet, I have found a photo of it www.flickr.com/photos/emdjt42/5292719037/ (with correct number plate, opposed to the incorrect one I gave initially)