Final update.
After an unsuccessful attempt using a file due to awkward access (the arm hanging bracket is in a perfect position to make everything awkward) we continued with the drilling. After one broken bit stuck in the hole and various other bits modified with an angle grinder (due to the aforementioned access problem) incremental progress was made. With the aid of an endoscopic camera shoved up the access hole in the chassis box section I could watch the other end of the bolt as my stronger, younger, engineer neighbour did the hard labour. Finally we could get a tap into the hole and with a few turns the bolt collapsed and wound itself out. With only minimal damage to the start of the thread the new bolt wound itself in happily and firmly.
Thanks for all your help and suggestions. Now for the other side...
Simon
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