Trottle pedal lose

[Robmk1]

My throttle pedal on my s1 moves left to right and can be a little unnerving under foot as it feels lose. Its probably not going to come off but is there anyway of stopping the movement?,

and could this be the course of a rattly sound when taking foot off pedal and slowing down?, when i put my foot slightly back on the trottle pedal it stops