Yasir Arafat has taken little time in reassuring Sussex supporters that there is life after Rana Naved.

The 24-year-old followed a sparkling 86 with the bat by taking two wickets in successive overs, including troubled England captain Michael Vaughan, as Sussex thrashed struggling Yorkshire by an innings and 25 runs with a day to spare at Arundel.

Facing a first innings deficit of 312, it looked possible that Yorkshire might hold up the county's bid for a sixth win out of seven in the Championship when skipper Craig White, aided first by Anthony McGrath and then by Michael Lumb, took their score to 135-2.

But when Lumb became Robin Martin-Jenkins' first Championship victim since April 27 it was the first of five Yorkshire wickets to fall for 27 runs in 15 overs either side of tea.

Mushtaq Ahmed picked up two of them but Arafat made the decisive intervention with two pearlers of which Rana would have been proud send Yorkshire into terminal decline.

Vaughan, who was not allowed to bat until five wickets had fallen after spending most of Thursday nursing hamstring and knee injuries, was leg before to the first delivery he received from Arafat, a nip-backer that defeated a tentative defensive push.

Worthing umpire Terry Urben, who is on the ECB's reserve list and was standing because Allan Jones was ill, had hardly endeared himself to the Sussex team by rejecting four confident appeals earlier in the day, three of them in one spell from an increasingly exasperated James Kirtley.

But after much deliberation he sent Vaughan packing and by way of extra celebration Arafat bowled Richard Dawson with a perfect inswinging yorker in his next over.

It will be impossible for Arafat to replicate what Rana, who took 87 wickets in 15 Championship appearances, did with the ball but by way of compensation the early evidence is that he looks a much more accomplished batsman.

If it had not been for a terrific piece of fielding by Lehmann in the covers, he may well have marked his debut with a century.

Resuming on 48, he rarely looked troubled as the last three wickets put on 105 to take Sussex past 500 for the first time in 12 matches, stretching back to last August's two-day win over Middlesex.

Even No.11 Jason Lewry, for whom the stage seemed set for one of his entertaining cameos, played responsibly to help add 33 for the last wicket.

Arafat struck Lehmann for a straight six and in the next over hoicked Dawson into the boards at mid-wicket. But trying to pinch a single off the next ball to keep the strike, he was beaten by Lehmann's turn and direct hit. His 86 came off 135 balls with eight fours and three sixes.

Although Lewry ripped through Andrew Gale's defences with the new ball when Yorkshire went in again, Sussex had to be patient on a slow pitch which reverted to Arundel type by yesterday afternoon.

Lewry and the unlucky Kirtley bowled superbly after lunch to ensure that the batsmen could never feel truly established and Mushtaq kept the pressure on when he was brought into the attack in the 29th over.

White and McGrath put on 88 in 32 overs but you always felt a wicket was imminent and Lewry returned to have McGrath taken at mid-wicket off a mis-timed pull.

Then came the moment Martin-Jenkins was waiting for as Lumb thick-edged to second slip, a long overdue success for the all-rounder who has been bowling well without luck in the Championship for the best part of two months.

Yorkshire were now on the slide. White's three hours of careful resistance ended when he failed to pick Mushtaq's googly and Mushtaq had Gerard Brophy taken at slip in the first over after tea.

Once Arafat had made his double strike it only remained to see if Lehmann could get enough tail-end support to see him to his hundred. Jason Gillespie kept him company for 12 overs before becoming Lewry's 500th first-class victim for Sussex and then Matthew Hoggard contributed a single to a ninth-wicket stand of 62.

Lehmann won a superb duel with Mushtaq, hitting him for three leg-side sixes as he lodged his third Championship century of the season. He finished unbeaten on 130, made off 135 balls with 19 fours, when Sussex wrapped up victory in the first over of the extra half hour.