Writing this just to give other slow-coaches a bit of comfort!!
Bought the Mustang (and I now believe I didn't need to as you get loaned one for the race??) and practiced in Arcade. Thought I was doing well enough not to be totally embarrassed online but accidentally made the stupid mistake of making some adjustments!
So, got online and whack - weight added, tyres changed and power reduced. Never mind, gave it a go. Driving it was like trying to walk on ice in slippers..... qualified 10th (read LAST) and 9th was er.... several.... seconds ahead. So, fingers crossed a load fly off the track and I might gain that way.
A load did indeed fly off the track in the early part - only to come back on and overtake me a little later.
And the final kick in the teeth?? The race finished before I'd crossed the line.... was on the home straight and "ping" - closed.
At least I didn't lose any SR (not possible, not anywhere near other cars most of the race!!)
So, after that "experience" and seeing the times posted here.... I will be sticking to "Campaign" mode for a while longer yet!