Something that has been missed out on the fleet archive for 5283:

In April 2011 (under the update for 18th April in the GNE archive document), as a result of 6001-6007 entering service, the vehicle was transferred to Stanley for trials on Diamond services 43/44. It was there until it was recorded in the 6th June update as having transferred to Deptford.

A photo can be seen here: https://flic.kr/p/9FsxJk