During the late 1980s, the class received an interior refurbishment that saw the wooden panel interiors covered with fascia panels, the removal of window blinds and other alterations. At the same time units lost their blue/grey livery (312/0) or all-over blue livery (312/1 and 312/2 as introduced) in favour of Network SouthEast (NSE) livery (312/0-1), whilst of the four 312/2 units, 312204 carried West Midlands Passenger Transport Executive yellow and blue livery and the others were dressed in the standard blue and grey, before their transfer to NSE.