Yes you want to hedge so then you can lock in the forward rate and receive more HKD (12.655 HKD/GBP), whereas if you did not hedge, then you will only receive 12.3 HKD/GBP.
From memory, although you should hedge, I thought that there was some consideration about if the investor feels that the forein currency may appreciate in the future, and if thats the case they may put in a 50% hedge.