With four units available for passenger service at any given time, Class 456 units, still in Southern livery but shorn of Southern branding, were introduced to South West Trains service from 23rd March 2014 on the Ascot to Guildford line, so releasing an equivalent number of Class 450 cars for strengthening other services. Eight units in this condition will soon be available allowing most of the Ascot to Guildford service (which requires five diagrams) to be run by Class 456, station lavatories being kept open longer to make up for the absence of toilets on these trains.

left, this notice explaining things was on display at Ascot on 29th March.
photograph by Ian Buck