A Global 6000 corporate jet, EC-LTF, took off from Madrid-Barajas at 15:15 hrs for a flight to Prestwick Airport. A training captain, conducting annual line checks on the pilots, occupied the jump seat. The captain was Pilot Flying. The flight proceeded without incident until the captain started the approach at night to runway 12 at Prestwick. The crosswind component was calculated being 11 knots. The right wing touched the runway on landing. The technique employed during the landing was different from that recommended in training material published by the manufacturer. Furthermore, the information in the training material about crosswind landings, and data on reduced wingtip clearance with increasing pitch attitude, had not been incorporated into the Airplane Flight Manual (AFM ) or the Flight Crew Operating Manual (FCOM). The pilot flying (PF) was looking through a Head-Up Display (HUD) and his view of the runway may have been impeded because the symbols on the HUD screen were set too bright. The report did not contain a probable cause statement.