Any body know of a mobile helicoiler or some one who is able to remove a snapped heade bolt from a block in situ

It shouldnt need helicoiling but they are the dudes who canremove snapped bolts arent they?

any help apreciated, I would have a go at removing it myself as I know you can buy stud extraction kits but I dont wona fuck it up any more

its about an inch into the block

cheers, Kev.