If you look at my lap time via the video time counter, it was not at all impressive. My best lap was about 2:12 second on the day.
Those Spec cars were driven by novices that came to the school. There was a 55 year old woman driving one of them.
I have my first solo run without an instructor posted on Youtube also. My times were horrendous at 2:25+ during that session. As I got more comfortable, I was able to brake later and hit the markers (guide cones) much better and my times improved. I have no reason to post a lie. I'm just looking for input like you did a short while back when you posted your experience.
Again, those were novices in those BIR Spec cars. Those cars could handily pound on my Boxster in the right hands.
Here's a link to my first solo attempt:
BIR - My First Solo Run - YouTube