 They made up a fourth set of carriages, increasing capacity and allowing more flexibility, but were criticised by for their smaller seat pitch, poor lighting, and lack of tray tables and power outlets.The pitch issues were rectified over the 2013 Christmas period by removing a row of seats and adjusting the location of the remainder, and additional tables fitted.The SE set operates as a 'standalone' consist, since the SE and SW carriages have slightly different electrical systems and cannot be mixed.