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@gbj_tester
The hole is already 6mm, so enlarging to 8mm in one hit is easy enough. Making a neat job has more to do with holding the workpiece and tool in accurate alignment than the actual type of bit - a cheap but new HSS bit in a drill press will make a much easier and better job than the fanciest bit in a hand held drill.
The counterbore/spotface definitely needs a drill press, but any machinist will have the cutter . I'd expect to give my local man £10 for this job (fork only)