That's the thing with Lydden. Its pretty much a free for all, as you only have <15mins per session. Not proper rules really.
I like to stay at the back on these sessions so I can have a bit of a overtaking session. Ive done Lydden so many times, so gets boring just going round on your own tbh, as its so short.
I think there were normally less than 20 cars per session on track, so normally wasn't too bad.