Hi Kev & Coasty. Thanks for the comments.
Was definately my first time - only other time I've ever shot a car was at the UK Le Mans series race at Donnington, with a compact Ixus around 3 years ago! No panning there!
Started out today at 1/250", but didn't get any keepers from those. Switched too early to 1/80" - only a handful from there - most of the keepers were from the 1/125" batch.
Hoping to get to Le Mans 24 this year, and thought I better get some practice in before I go. If this is the level of keepers to trash, I better get a few memory cards sorted!
Still not happy with them really, as none are pin-sharp - have seen quite a few on here and Pistonheads, all of which look superb. Will have to keep plugging away, I think.