According to the 747-400 ABC book, Cathay provided RR with an aircraft in 1998 to complete its G to HT certification program. Given CX's committment to the RR program, I would assume that all 747-400 in the fleet are HTs by now (stand to be corrected).
http://www.pprune.org/forums/showthr...ighlight=rb211
http://www.pprune.org/forums/showthr...ighlight=rb211