Cherry Red Records Hellenic League
Milton were up against it after 90 seconds as Matty Saye latched on to a poor backpass to put Swindon ahead.
Milton grafted hard to find the equaliser, but with only Jamie Evereid playing in a striker's role, home keeper Chris Webb was rarely troubled.
Supermarine made it 3-0 through Richard Hadgkissin after 64 and 77 minutes, and right on the final whistle, Hadgkissin completed his hat-trick.
The only plus for Milton was the promising display of teenage keeper Gareth Walker.
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