At the Donington days we attend, they ask you to decide if you're novice/ inter or expert.
Sadly, no-one or at least not many of the people that attend these days likes to be classed as a novice, so the inter group get's very busy.
Now, if a novice is in a Lambosakirrari (enter your fav super car here) and someone that's a bit handy in a Mini race car we'll say for arguments sake, overall the mini might well be as quick around the circuit and catch the super car up.
What tends to happen next is the super car driver has an ego as big as his service bills and doesn't yeild to the mini on the straights.
The rule of watching your mirrors and yeilding to faster cars ( not bhp, overall pace around the circuit) is explained in the breifing, but no-one seems to listen.
Can get very frustrating.