I see what you mean.

Dantomkia = Through to Semis
Behemoth = in 6th series
Kat 3 = in 5th series
Panic Attack = winners of Series 2, in 6th series
Pussycat = in 6th series
King B = in 5th series
Bigger Brother = runners-up in Series 5, in 5th series
Firestorm = 3rd 3 times, in 6th series

A lot of veterans.