Yes the flame is predominantly blue. It's only really yellow when I wake up (having left it on overnight around no. 3-4 (when freezing outside)), but I turn it down to 2 and it soon goes back to blue. I find it struggles a bit on lower settings when it's freezing outside and doesn't burn consistently, so I need to put it on 3 or 4. I didn't have the issue with coking before the temperature dropped but the burner net now has a layer on top after every use (which I clean, otherwise the flame does not burn well and it sometimes lets off fumes). The diesel is different from what was being used before and I've changed the brand of methylated spirits I use, is that likely to cause this effect? Do you add additives to your diesel or cleaning tablets in your burner pot?
Thank you for all this, it helps greatly. As you can probably tell, I am absolutely clueless 🤦♀️
Yep, totally knew that 🤦♀️🤣