Solex 34 PICT-5 won't idle

I have a manual 1.6 Golf with a Solex 34 PICT-5 carb. Up until recently it has run perfectly. It still runs perfectly on the choke, and during normal driving its fine, but once its warm it will not idle , it just dies. It will restart Etc. The only recent change is a replacement radiator (like for like).

All hoses Etc look undamaged, and everything looks visually looks fine.

Any advice Etc would be very welcome.

idle jet or circuit is plugged.