You are into transferring a Rating on a Foreign Licence to a UK (EASA). Went through this in Feb this year. You can get the Info off the CAA Website looking at the Part 804 stuff. Anyway I personally went to a UK ATO and did an LST and was asked by the Campaign to sit the Type tech again which this ATO sorted of course. I read no need to do Type tech but as we all know the Kiddies that work there dont know either.
If you haven't got it yet you have to pay another 130 quid for the EASA Issue cos they cant put it on your JAA. Also make sure your HK Lic and MED is current when you apply.
Hope that helps,