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@ColnagoDaft
If it hadn't sacrificial welded into the tube completely, I find plus gas, and/or the heating/cooling trick will do the job quickly.
If it HAS welded then you're either into sequential reamers (almost certainly seatube man's method) or corrosive methods.
I've tried to get a local engineering shop round our way to semi permanently set up.a horizontal borer at 27.2mm which I've used previously successful with no damage to paint or frame. It took literally 3 seconds to make toast of the SP.
His argument though is that there's simply not enough business there to have it set up full time. Maybe in London though.... You can pick em up for a few hundred sovs on ebay.