Driffield's James Cowton, the current Duke Road Race Rankings Champion continued his efforts to retain the Geoff Duke Trophy, taking a double victory at the Post TT Road Races, round 8 of this years series.

Held on the Billown Course in the Isle of Man, home of the International Southern 100 Road Races, the Yorkshireman opened his account with a 3.654 second victory over fellow Yorkshire rival James Coward after a closely fought battle in the opening laps, with yet another Yorkshireman Adrian Harrison filling the third podium place.

The second race featured the popular SuperTwins, in which the same three fought for the honours, with Cowton again taking the chequered flag, this time from Harrison with Coward third.

In the final feature race for Superbikes it was Manxman Ryan Kneen who dominated proceedings with a 5-second victory, this time over another Yorkshireman, Mark Goodings with Londoner Mark Parrett third.

Whilst Ian Hutchinson remains the current leader of the Duke Rankings 2015, his advantage has been reduced to 64 points by James Cowton who moves up seven places into second, demoting seven times winner Ryan Farquhar to third.

Jamie Coward climbs four spots to 11th, whilst Adrian Harrison rises eight rungs to 21st position.

Pos Rnd 8 post TT Rd races -  Rider - Previous Rnd 7 IOM TT -  Moves - Points

1 Ian Hutchinson 1  No Change 603

2 James Cowton 9 Up 7 539

3 Ryan Farquhar 2 Down 1  520

4 Lee Johnston 3 Down 1  487

5 Ivan Lintin 4 Down 1  476

6 William Dunlop 5 Down 1  458

7 Guy Martin 6 Down 1  456

8 James Hillier 7 Down 1  430

9 Jamie Hamilton 8 Down 1  421

10 Bruce Anstey 10 No Change 398

11 Jamie Coward 15  Up 4 364

12 Alastair Seeley 11 Down 1  320

13 Dean Harrison 12 Down 1  319

14 Michael Dunlop 13 Down 1  315

15 Derek McGee 14 Down 1  299

16 John McGuinness 16 No Change 289

17 Paul Gartland 17 No Change 226

18 Ben Rea 20  Up 2 216

19 Daley Mathison 18 Down 1  214

20 Michael Sweeney 19 Down 1  203

21 Adrian Harrison 29  Up 8 200

22 Mike Hose 21 Down 1  181

23 Jeremy McWilliams 22 Down 1  181

24 Alan Oversby 23 Down 1  170

25 Seamus Elliott 24 Down 1  167

26 Andy Lawson 25 Down 1  148

27 Michael Rutter 26 Down 1  146

28 Peter Boast 27 Down 1  137

29 Ian Morrell 28 Down 1  137

30 Daniel Hegarty 30 No Change 129

31 Nigel Moore 31 No Change 128

32 Paul Robinson 32 No Change 126

33 Mark Goodings 79  Up 46 117

34 Michal Dokoupil 33 Down 1  113

35 Neil Kernohan 34 Down 1  113

36 Joe Newbould 35 Down 1  113

37 Conor Cummins 36 Down 1  112

38 Barry Davidson 37 Down 1  111

39 Sam Wilson 38 Down 1  108

40 Nick Anderson 39 Down 1  107

41 Darren Cooper 40 Down 1  105

42 Jay Bellers-Smith 41 Down 1  102

43 Billy Redmayne 105  Up 62 101

44 Gary Johnson 42 Down 2  100

45 Richard Ford 43 Down 2  99

46 Paul Owen 44 Down 2  99

47 Tommy Henry 45 Down 2  97

48 Rhys Hardisty 46 Down 2  96

49 Kevin Fitzpatrick 47 Down 2  95

50 Jamie O'Brien 48 Down 2  94

The next two rounds take place at Oliver's Mount, Scarborough at the Barry Sheene Race & Rally Festival on Saturday and Sunday 20th & 21st June and the Kells Road Races in Co Meath in Eire on Sunday 21st June 2015.