Thanks everyone. Most grateful. Turns out that new year's eve is not the best time to try and get a mobile bolt remover to visit. Who would have thought? I've left messages and see whether anyone wants the job (the next time I phone a technician I won't tell them exactly what the problem is - more chance of a reply I reckon). I like the ideas here. I'll make a drill guide out of what's left of the bolt in case the technician want's one. On the plus side, my wife's quite happy: I couldn't face driving her car in the state it was in so spent an hour or so today cleaning it. I also discovered that Bryan Burt Ford (big Ford dealership in Capalaba, Mansfield and Mt Gravatt) has gone under and the doors are now permanently shut. Got a new bolt out of an xr8 block at the wreckers instead. Oh, and I now own a torque wrench. It looks very pretty and shiny but 24 hours too late. Best, Dev Edit: corrected horrendous spelling.