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Cheers, I'd actually thought of that, kind of, I only have one laser currently so that obviously leaves room for error on the other plane, although there is a margin for error that can be accounted for on one of the planes by virtue of the post that's fixed to the bracket I'm drilling for. Also the stones are fucking hard and at chest height, so eyeing the bit and drilling might be tricky, will see if I can borrow another laser from somewhere.
Polygon
Grumpy_Git
Lasers. Two at right angles to each other, one following the plumb line.
keep the lines down the shaft of the bit and you'll be bang on.