Purton is based in the region and lifted the prize despite not riding a winner in the four-leg series.
His tally of 16 points, thanks to three seconds and a third, was enough to give him victory over Doyle, Marquand, James McDonald and Mickael Barzalona. They were all on 12 points after each riding a winner.
Marquand produced Awesome Treasure with a pulsating late run to take the first leg for trainer David Hayes.
Purton looked like making all on Circuit Seven, but Awesome Treasure picked up strongly for Marquand and got up close home to win by half a length. Fabulous Eight pipped Circuit Seven by a neck for second spot.
Not to be outdone, Marquand’s partner Hollie Doyle landed the second leg on Viva Hunter, just edging out Purton on Glorious Lover by a nose.
Purton was also just touched off in the remaining two legs. McDonald took leg three on Invincible Missile from Amazing One Plus, with the Barzalona-ridden Elon taking the fourth and final leg. The winning margin in both races was a short head.
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