HKG airport security only has very limited fast-track for pregnant ladies, the elderly and other high priority groups. If flying Cathay First class I have sometimes been given a "magic ticket" for this line.

However, it is unimportant as security in HKG rarely takes more than 5 minutes, 10 minutes at most. They can show Manchester airport how to do it, with things like: Liquids can stay in bags, some machines laptops can also stay in, and you can go through the scanners with belts, watches still on you. It is a different world... Oh, and they always have plenty of machines opened up. Only during really peak periods (Golden week, Chinese New Year, a public holiday weekend) does it feel busy.