Joystick or pad?
I doubt you'll find any sticks with force feedback for under £30..
Some people recommend the Speedlink Black Widow in that price range; No FF though. I couldn't vouch for it as I use an X52 but I often see it being given as a good starter joystick.
I just bought one of these from Overclockers and it does have FF ........
I thought it was more of a vibrate function rather than a true FF?