Thanks oliver, those 2 are by far my favourite, not often I'm truly happy with images but I'm pretty proud of those if I'm honest. I know the last was taken with my 30mm prime, think the 1st was my 70-300mm which is why there isn't much space around the car.
Does the appature make much difference to panning shots? I generally shoot in shutter priority with 100 iso, but not sure if raising the iso up a bit (niton d7100 so can add some if need be without too much issue with noise) if it would help with getting more in focus