As per title folks.
She’ll start fine from cold but when warm will splutter at around 1500 RPM which clear at about 1800.
Switch off and she won’t start again until cold.
Any ideas?
TIA.

You could try looking at the IAC valve [ Idle Air Control Valve]. It's beside he throttle body and has an 'J' shaped air pipe from it to just before the throttle body. Take the inlet pipe off and give a good squirt of carb'y cleaner.