A class 421/4 (4-CIG) and 421/3 (4-CIG) pairing of 1805+1744 forms the 1706 Bognor Regis/1636 Portsmouth Harbour-London Victoria service at Gatwick Airport on 26/05/1992. The two units combined at Barnham, the junction for the Bognor Regis branch, for the run up to London.