(21 May 2014, 8:28 pm)AIG20 wrote I guess this may be a replacement "active reserve" vehicle for the now scrapped 21153. I wonder whether another T-reg ALX300 has been sent to replace the still active 21155 as I know that 22727-22730 will never see service again.
Here is the image by Sean Blair bellow:
https://www.flickr.com/photos/77351420@N04/14052847480/
South Shields at have 1