As far as I know the UK are more liberal towards violence in games/movies.
ya, we let anything slide right in.
from what I can gahter almost all of my games have used the BBFC (12,15,18) rating system and on the actual game boxes it has the BBFC logo under the number.
18s - L.A Noire, dead rising 1 & 2, bioshock 1 & 2, condemned 1& 2, dragonage, fallout, left4dead 1 & 2, borderlands, Red dead,
15s - Assassins Creed 1, 2, & B, Orange box, Oblivion
Only mirrorsedge and a tom C game have used Pegi
ofcourse, this is only my very limited sample. looks like Pegi is being used more and more