I read a thread here a while ago about how you could get your council tax band reduced. I did this and got it lowered saving a few bob. Result.
I used this to try and get my rent reduced as I thought that was high too and I found out the similar property was paying much less too.
I finally got a letter last week from my housing trust confirming that I have indeed been overcharged since October 2006 when I moved in.
The total rent overcharged being £1146.94!!!
Just goes to show what you can do by writing a simple letter. :)