EDC on 98 Disco Diesel Auto?

Someone must know.

I've been trying to connect to the ODBII on my Disco but the interface 
I've bought doesn't want to talk to it.
Anyone about know whether it is a real ECU/OBD or is it a fake LandRover 
clone?
I know it wasn't common for 300TDis to have the EDC until the very late 
ones, except for those on auto, mine's both late and auto.
Your assistance would be most appreciated.

Geoff

-- 
Wisdom and experience come with age, they say, but I wish I could 
remember the darn question