It took me over two evenings about 4.5 - 5 hours with the drill and a number of drill bits.
Big Thanks to all that chipped in with ideas but special thanks to 'ncarnall' as it was masonary drill bits that let me win in the end - Cheers mate.
As for the remainder of the bolt (it snapped at the base of the cone), believe it or not i unscrewed it with my fingers out of the hub!!!
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