Hi mhalliday, thanks for your views and recommendations.
I'm pretty sure I dont have any more air in the radiator. I filled and bled it very carefully. The radiator actually has a bleed screw at the opposite end to the inlet/outlet barbs. With the rad in its current state (horizontal) this bleed screw is the highest point and I did get air out of it even though I thought I had done a good job filling it with the rad vertical so any bubbles would rise to the outlet barb immediately.
What kit are you getting?
Daniel, sure thing! PM me with details.
Laz.