Im after about 5m of 10mm speedfit plastic pipe, but i dont really want to
have to buy a whole 25m coil of the stuff.

Does anyone have any they dont want/ know of anywhere i can get shorter
lengths.

Try some local plumbers merchants. I recently bought about 10m of 15mm Hep2O
pipe from one local to me...which they just cut from a roll and charged me
appropriately.

Glen