Land Rover Repair: antifreeze/coolant leak, cylinder head gaskets, antifreeze coolant

Question
I have a Disco II and been leaking antifreeze from the back part of the engine, it looks like a steady stream, I'm having to put water every day.  My thermostat so i'm replacing it but i can't find the leak, any suggestions of what i should be looking for?  

Answer
Coolant leaks from the back of the engine are most often from the intake manifold.  Cylinder head gaskets leak also, sometimes in the back left where you can't really see.  Try and see which of these problems you have by using a mirror while pressure testing a cold motor.  It's one or the other or both, almost for sure.