Here is the address for fans to write to:
The JC Group
No. 70 Pak To Avenue
Clear Water Bay Road
Clear Water Bay
Just to be extra clear - the office is not open for fans to visit. This is a mailing address for fan mail only.
How to request a signature.
In order to request a signature send your chosen photograph together with a self addressed envelope and an international stamp coupon (ask at your local post office) for the cost of the stamps to send it back to you.
Wait patiently. In general it seems to take between 4 and 6 months.
Don't forget to write PHOTOGRAPHS - DO NOT BEND on both envelopes.