Posted: 27 January 2013, 14:32:02

Found this on the NR media centre page. Seems that the 313 won't be getting a new departmental number.

http://www.networkrailmediacentre.co.uk/News-Releases/7306/ERTMS-train-for-Hertford-National-Integration-Facility-takes-shape

Posted: 11 February 2013, 19:33:05

This is now on website. Search for 313121 to get individual vehicles. I'm assuming the vehicle numbers haven't changed!