how do I change clutch cable in Webb Lawn mower?

The clutch cable needs to come complete with inner cable & outer cable casing.
1st remove the clutch cover plate, (should be 4 screws) undo the return spring, then undo the small securing nut with a small spanner.
Remove the other end from the pull handle.
To replace,ensure that the tension adjuster is wound into the closed position, then the connect the lug into the pull handle, connect the other end to the clutch disengaging lever, secure the return spring back on, check tension by pulling the handle, the lever should push on a small piston into the clutch drive, adjust tension as necessary, replace the cover plate, and secure the screws.
I am going through the same process, but I don't know where to buy a new clutch cable, can you help me?

Jim Worsley, Southampton.
September 2010