thanks Briggie, found it on the photos in the manual (not in EM though, it's in MA
http://bebrs.pie-dabas.net/Webs/Terrano/R20/ma.pdf)
Now to translate that to the car .....
I'm wondering if this part is really necessary :
1. Set heater “TEMP” control lever all the way to “HOT” position.
2. Remove radiator cap and engine under cover.
3. Disconnect lower radiator hose to drain coolant.
Remove reservoir tank, drain coolant, then clean reservoir tank.
Re-install tank temporarily
Obviously I'll have to remove the rad cap, and maybe I'm being pedantic, but surely this can be done with the engine in the car, and outdoors ? Oh well, off to Argos to buy another pikey garage (gazebo)