massive water leak from under inlet manifold

Hi all, does anyone know if there is a coolant pipe or some gasket that might be causing a huge leak under the inlet manifold on my 2003 TD5 Disco please. I tried to have a look today but without removing lots of metal it's very difficult to spot anything. I've a feeling it's the head gasket that has gone, the water is literally running out as I refill the tank. Can't seem to find my Haynes manual to have a look myself. Cheers all and thank you.

Yes there is, there is the fuel cooler.

The O rings inside can fail.

http://www.discovery2.co.uk/fuelcooler.html ( number 31 in the picture below) OR it could be a number of other pipes....

Well, completely wrong about the head gasket going, wish it had have been, probably would have been a lot easier if not a lot more expensive. Looks like I've not been keeping up with the coolant strength and have rotted through one of my core plugs from the inside. Of all places, the one right behind the engine mount. what a pain in the ar#e that was to get to. 3 hours stripping out the inlet side just to replace something that cost a few quid. All done now n seems ok, thanks for the input.