Well, it was the rad. No more coolant loss since. So have been really enjoying it up until recently.
Sad to say it developed stiff power steering when warmed.up, thought it likely the pas pump. It just started making a noise in that area of the engine, so thought it most likely the pas pump again. Removed aux belt and noise remains...... Sh1t! It's more audible inside the car, but not so much outside.
Leads me to suspect a rough bearing around the timing belt.
Have been left weighing up my options. I love the car to bits, but simply don't have the money to pump into it.
It's worth more in bits, but too good to break up. Sad times 😔