(11 Feb 2015, 5:07 pm)AIG20 wrote The ADL E200 on the "E" services was 36479, whilst an ADL E300 was on the 3/4/7/8 circuit.

Information from SNE Twitter Page:
SS Ops: The 15:37 E2 Svc from S/Land will depart Park Lane approx 15 mins late due to mechanical failure, apologies for the delay.

Do you know which vehicle was running 15 minutes late?

As I said before, the unidentified ADL Enviro200 was running 16 minutes late on the 1537 E2. Guessing it could have been one of Sunderland's and the one you saw was on another working?