I had a go at a bodge solution last night: cut a strip of aluminium out of a beer can, matched it to the circumference and width of the splined part on the spindle, wrapped it around the spindle and squeezed the crank arm on over the beer-can-shim, the splines on the spindle crush the soft beer-can alu into the worn splines of the crank arm, thus filling the gaps.
My mate said it might work, i was skeptical, but after 20miles around the long mynd today my cranks are 100% wobble free. Not sure how long it will last, but if its until after xmas when i should have some money to buy a new crank arm/crank set then i will be happy. :D
cheers for the offer kaesae. i will let you know if my solution fails! :D