Thanks all for the above. I’m going to have a look tonight.

JE tried to help but were not too successful

There are some replacements available for Range Rover 3.9s for not too much money on eBay (£80), but they may or may not help

I understand it’s possible to adjust something with a screwdriver but without an emissions meter it’s not easy to know if that does anything or not.

Think I’ll clean it and see if that helps, my MOT guy is pretty good and ‘gets’ older cars

Get the Morgan vibes come in my way....—__—__—__

Thanks chaps

2012 Plus 4 in Sport Green. Much comfier than the Plus 8!