Radiator Fluid going down slowly

Many thanks KH, I will get some dye into the system. I like your answer better than pulling the head unnecessarily! Cheers, Jim

After putting the dye through my radiator and seen it leaking from:

A hose joint.

And also from the join between the gearbox and engine.

My mechanic has quoted around $300 to fix the welsh plug (which he claims will stop the leak between engine and gearbox).

I'm just going to keep topping up the radiator fluid each month.