Ok, here's the answer
The HK authorities just need to see a copy of our Company Ops Spec which says our local authority approves the company to operate RNP 1 SID's with an RF Leg. We obviously don't have this yet because there have never been such a Nav Spec requirement in the past. I have shown our authority that aircraft are capable of such a procedure and they are happy. Just a paper work exercise really.
The new 4th Edition of the ICAO PBN Manual (doc 9613) also deals with this issue. Expect more of these types of procedure in the future, they make a lot of sense in busy airspace.
DH