Hope this isn't too late. I was on FTRS when I went to the HK 7's last year.
I let the local MI Section know I was going (NB not asking to go - it helped I knew their WOII & Boss pretty well). It involved filling out a couple of forms & a short interview on return.
Won't go into any more, but there were an awful lot of Mob out there (the Andrew had the biggest White Ensign since Trafalgar hanging from the stands!) Just cover your arrse by making sure you mention your plans.
If you are planning to go, try oasis hong kong for your flight. I went over there in Feb with these guys and the price was outstanding. The service was pretty good too but I must admit to being doped up on Diazepan for most of it!!