Thanks all.

I had wipe dry the wet areas, hoping to observe the leak reoccur.
The leak seem to come from that corner on the bottom. Touching the 2 hoses nearby, its completely dry.

Phil where is the Radiator drain valve? Is it facing down & can I use finger to tighten or a spanner? It seem to originate from that exact location. Do you have a schematics of the Radiator?

Kind Regards