Cheers Brettus!
Ive been wanting to do those pics for ages, and my new lens allowed it. I was really lucky with the star trails, there was a spot to park and a decent place in the field next door to work. I set the camera going controlled by Triggertrap and sat back in the car. It was nearly zero degrees!
Still a bit bothered by the light pollution. I'll be off to Cumbria in the spring where I've got a shot planned.
Pete