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Success! Well that was a jolly couple of hours.
Initially the drill bit was just skating off the bolt head, suspect potential work hardening from impact gun etc.
Bolt head eventually gave in to firm attention from die grinder and then drill bit although when the bolt head was completely removed it was still not possible to drift out the remnants, using a tool punch and 4lb club hammer, it was decided to continue with the drill and then try drifting again as further drilling progress was made through the bolt.
Eventually the bolt surrendered, drill bit appears to have gone off centre very slightly but the swingarm appears unharmed.
Thanks again all for kind support and suggestions.
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