replace the clutch with new only
when you replaced the brake caliper did you check to make sure the slide pins are both free. These do stick and seize up. With a bit of heat you can free them off if not the they will require replacement and a new carrier
Thanks for that information!
Slide pins were both seized, bit of heat and gentle persuasion got the free. Cleaned up, greased and reassembled. Brakes now working fine without heating up.
Now just need to work out if my other problem is the clutch, and if it worth getting a mechanic to replace or give it a try myself?