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[Ewan]

Sorry, I do tend to live in the past. I meant 1996. Core plug - interesting, but surely there would be drips in evidence?

[dbug]

heater matrix don't tend to leak, its much more likely a coolant leak else ware like HBV, check that first 

Mine did 

[Bionic]

Same problem I had and I just pulled both pipes of the heater and joined them under the bonnet. Car then ran without any problems until I finally got around to checking the heater matrix itself months later and found its core to be leaking from its top tank seam joint. The leak was so small that although I could smell it I could not see any leak because the heat from the heater was drying it up before it could be seen.
New matrix and the heaters were back to what they were and no more smell. Lousy job to change though.
If it is leaking from the heater matrix you probably will not see it leaking under the car either.
Worth checking what the others suggest though but never think that it cannot be the heater matrix, mine was!
GudLuk

[Ewan]

Thanks. I have not noticed any coolant pong inside the car though. Maybe it's not potent enough to overcome that luxury leather upholstery smell. It's one of the best things about the car.

[Bionic]

My Elite, all the bells and whistles were fitted from new, is all leather too so it looks like it cannot be that that is leaking.