

It's the block at the front/right of the engine bay, just next to the gear linkage. This is what Brickwerks call the Coolant Distribution Junction, right?

Looks to me like it's leaking from the end cap, rather than one of the hose connections - if this is the case, is this a "Sort NOW, before it goes pop" or a "Just keep topping it up, and it'll get no worse"?
The S-shaped hose from head to junction I can find, but it looks like the other two to it are the ones to the front - one heater (that's a single rubber all the way to the valve/matrix behind the dash, right?) and the one to the main front-rear pipe. Can't find that on BW - any suggestions, or is it just a length of standard straight hose?