Des Smyth and David Higgins finished eight under par, Gary Murphy seven under and Eamonn Darcy level par.

Swindon's David Howell was alone in third on 11 under with Worthing's Gary Evans, Swede Carl Pettersson and France's Christian Cevaer another shot back in joint fourth.

The 24-year-old collected the first prize of £166,660 to take his earnings over £300,000 in under four months and into the top 30 in the Order of Merit.

Casey, a former top amateur who won four points out of four in Britain and Ireland's Walker Cup triumph at Nairn in 1999, began the day one shot behind Cejka, but was quickly in front when he birdied the third as the German made a bogey five.

A bogey at the next allowed Cejka to get back on level terms but the German promptly dropped a shot at the next and after they swapped birdies on the eighth and ninth, Casey led by one at the turn.

Howell then got in on the act in style by holing his second shot from 107 yards for an eagle at the 13th to briefly make it a three-way tie for the lead, before Casey made what proved to be the decisive move.

Birdies at the 12th and 14th, the latter from 50 feet, took him two clear and although he bogeyed the next another birdie at the 16th put him two ahead again.

Cejka would not give in however and birdied the 17th to close the gap to one but Casey held his nerve, holing from eight feet for birdie at the last with Cejka slightly closer, to make sure of the title.