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The Scott numbers, however start at "1" and count up. Does Scott have a separate numbering sequence just for the Machin issues?
Yes, the Scott catalogue listings were organized about 10 years ago with the Machin head definitives placed in their own section at the end of the British listings, with the stamps renumbered using the prefix MH (MH1, MH2, etc.).
Welsh, Scottish and Northern Irish Machin heads have their own prefixes as well, WMMH, SMH & NIMH. The four Isle of Man Machin heads are still listed with their old catalogue numbers, however.
Ryan