Fenwick secured the dream win in the tournament with the poise of a veteran in a rollercoaster final round which saw at least five players in with a chance of winning the coveted first place.
The 27-year old from Bognor Regis in Sussex fired a determined 70 for a final total of 7-under-par 281, to win by three strokes from South Africans, Jeandre Neethling and Johan Etsebeth and banked the winning check.
Etsebeth, who shot the tournament lowest round of 66 yesterday, closed with an even-par 72 and Neethling 1-under-par 71 to finish one stroke ahead of promising amateur, Jakobus Roos, who carded 72 for sole fourth place and earn his first pro money.
There was no sign of the Grant Veenstra who was in contention from round one. Instead the diminutive Veenstra put on a Jekyll and Hyde performance, with an early birdie at the second, then bogeys on the third and the fifth, found his form for a wee bit with birdies at the seventh and eighth to begin the back nine on 1 under for the round and in contention for the title.
But the 24-year old from Bellville went off course again, with a double drop at the 12th and then ran amuck with a string of bogeys from the 15th to the 17th to finish with a 4-over-par 76 for a share of seventh on even-par 288.
But the day belonged to Fenwick, who will be heading back to England to source some much needed sponsorship.
'I'm happy to win again,' said Fenwick, who won the EuroPro Tour Qualifying School almost a year ago. 'I feel really lucky and I still don't know what the difference was for me today.
'Like in yesterday's round, I putted really solidly today, hit some really good iron shots and holed some crucial putts. But I am delighted to have come out all this way and then winning it.'
Starting the final round with a one-stroke lead, the methodical Fenwick collected two pars and an early birdie at the third on his way to victory. He dropped his only shot of the day at the par-4 fifth, but made up with a birdie at the par-4 seventh to take the lead and turn at 6 under.
'I think the turning point was that mammoth 35-foot putt for birdie at the par-5 13th. I haven't been able to hole a putt further than 12-feet all week, so that just set me up, got my confidence going,' said Fenwick.
His final birdie at the par-5 16th sealed Fenwick's lead with two holes to play.
'I would have loved finishing with a birdie, but I wasn't going to divert from my strategy all week - tee to green and take the birdies where they fall. I guess my patience was tried right up until the last hole,' laughed Fenwick.
The Sunshine Tour awarded 42 non-exempt status playing cards for the 2005-2006 season, with the cut set at 7-over-par 295.
The last four cards were awarded to Graeme Francis, Glen Ashton, George van Staden and Zimbabwe's Travis Fraser, who holed an ace at the par-3 third hole to guarantee him a share of joint 39th on the final leaderboard.