"Up to x mb broadband"
What was it they said a couple years ago... Something like 40% of bandwidth goes to the top 0.5% of users, 80% of total bandwidth is used by 10% of users and the bottom 80% of users use only 10% of the bandwidth. Note: Independant figures, but not UK figures.
And apparantly P2P was down to 20% or less in '08 with youtube using over 50%... No wonder traffic shaping hasn't made a huge difference.
In that context shaping P2P traffic down to 25% of port capacity isn't actually that draconian if it was only using 20% to begin with
Mind you, I use a lot lower percentage of my line's capacity than I did a while ago mainly because my hard drive space hasn't increased in line with internet connection speeds.