Thanks for the reply printbus - Spiral /Vase mode works fine, and I do indeed have a 40mm fan fan with fan shroud cooling the print.

What the aim was by printing out the single wall was to highlight the issue. I haven't tried multiple wall prints for a while as I was trying to get the printer to print near to perfect before moving on. I will print some test prints with 3 walls and get back to you with a picture.

I think the next move will be to switch back to the e3d v6 and give that another go as well.