
After an evening of fun, I found why I'm still losing coolant, and the top of the gearbox is all wet

Hm, never seen one go there before. Investigation reveals slight split in rubber pipe between the metal one and the thermo housing. Repair made using cut off piece of surplus braided hose (replaced last week) and 2 new hose clips. Appears leak free.
Whilst under the car I found that the metal pipe down the back of the head was in fact OK, and that I had a new oil leak, which maybe or maybe not the oil pressure switch. Oh, and I need an O/S front strut return pipe. Ho hum.