He totalled seven-under 281 as he sunk in four birdies and two bogeys from 11th to 18th.
While he did not drop a bogey on first as he had done first three days, he did drop a bogey on a Par-5 at 11th, but birdied the Par-5s at second and fifth and parred 17th.
The 23-year-old Swede Marcus Kinhult (70), winless as a pro, played excellent golf on the final day and held his nerves over the final few holes, as overnight leader, Matt Wallace (71) showed chinks in his armour in the final stages.
Wallce, defending champion Pepperell and McIntyre were tied for second, while Richie Ramsay who had a double on Par-5 second was fifth.
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