CharlieLS,
PIC is mainly you fly the aircraft by yourself such as solo flying.
PIC U/S is when you fly the aircraft under your command but with supervision of an examiner such as taking a flight test.
SPIC is only applicable if you did your training on an integrated route. Howeve though, HKCAD only recognise Adelaide flt school! If you did it else where then it will be count as P1 U/T
P U/T is where you receive instructions from your instructor when you learn to fly i.e Dual flt.
You can also check it out on HKCAD website!
Hope it helps.
n.dave