Thanks for your reply and input Grumpy.
The ID I've imported from the Newtriton website and reflects that I drive a Mitsubishi Triton. A single atom of Tritium is called a Triton.

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No access to a mill unfortunately. Woodruff keys are used.
As can be seen from the photos mower is close to its useby date. I just want to keep it going that little bit longer. I don't actually need a ride on (live in town) but want to use it for shunting my caravan around plus the odd mow here and there. I was also thinking of roughing the shaft up and using some bearing loctite and adding a few washers between the nut and wheel to push it on real tight. Another thought was to drill wheel and shaft through and pin the assembly. Basicly a low cost repair is what I am looking for as she isn't worth much. I bought three Greenfields together two older 11's and this 8. One of the 11's goes OK but leaks oil, the other goes but needs "start ya bastard" to get it going. Plan on selling those and keeping the little one as storage space is at a premium.