Dragon Slayer and Dragon Tamer duathlons, were held on Sunday 6th April 2003 at the Eastway Cycle Circuit, London E15. The Dragon Tamer is 2 mile run, 7 mile bike and 1 mile run, and the Dragon Slayer is 3 mile run, 20 mile bike and 5 mile run. Both organised by East London Triathletes and sponsored by triandrun.com and Tri Resources.
| Pos | # | Name | Club | Age | Cate | Sex | Run 1 | Bike | Run 2 | Total |
| 1 | 40 | Dewey, John | Phoenix Tri | 22 | M | 00:17:33 | 00:52:07 | 00:30:56 | 01:40:36 | |
| 2 | 52 | Hotchkiss, Jonathan | 24 | M | 00:17:30 | 00:55:15 | 00:30:37 | 01:43:22 | ||
| 3 | 48 | Bruce, Alasdair | Tri Sport Epping | 32 | M | 00:18:17 | 00:56:39 | 00:33:41 | 01:48:37 | |
| 4 | 45 | Banister, Robert | 24 | M | 00:17:20 | 00:58:44 | 00:33:03 | 01:49:07 | ||
| 5 | 17 | Henty, Simon | Team Viper | 27 | M | 00:18:07 | 00:57:07 | 00:35:51 | 01:51:05 | |
| 6 | 1 | Spelling, Alan | Met Police Tri | 55/56 | SV | M | 00:18:44 | 00:58:54 | 00:34:03 | 01:51:41 |
| 7 | 16 | Cairns, Mick | Victoria Park Harriers/Tower Hamlets AC | 41/42 | V | M | 00:19:20 | 00:59:20 | 00:33:23 | 01:52:03 |
| 8 | 6 | Houlihan-Burne, David | 32 | M | 00:19:24 | 00:58:53 | 00:34:59 | 01:53:16 | ||
| 9 | 4 | Bly, Jude | 29/30 | M | 00:18:46 | 01:01:44 | 00:32:52 | 01:53:22 | ||
| 10 | 8 | Wright, Quentin | Serpentine RC Tri | 42/43 | V | M | 00:19:38 | 00:58:27 | 00:35:30 | 01:53:35 |
| 11 | 51 | Hjelm, Sam | Brewed Force | 28 | M | 00:20:09 | 00:57:59 | 00:35:46 | 01:53:54 | |
| 12 | 19 | Kinch, Gareth | Met Police Tri | 36 | M | 00:20:25 | 00:57:57 | 00:36:34 | 01:54:56 | |
| 13 | 12 | Henigan, Steve | Team Viper | 23 | M | 00:20:20 | 00:58:55 | 00:36:40 | 01:55:55 | |
| 14 | 47 | Melville, Neil | Serpentine RC Tri | 36 | M | 00:20:05 | 01:00:24 | 00:35:49 | 01:56:18 | |
| 15 | 2 | Stark, Richard | 40/41 | V | M | 00:19:29 | 01:02:49 | 00:34:18 | 01:56:36 | |
| 16 | 29 | Thurlow, Dean | Crystal Palace Tri | 46/47 | V | M | 00:21:16 | 00:59:57 | 00:36:44 | 01:57:57 |
| 17 | 15 | Proctor, Simon | 42 | V | M | 00:21:09 | 00:58:29 | 00:38:20 | 01:57:58 | |
| 18 | 36 | Weston, Clive | Tri Sport Epping | 45/46 | V | M | 00:20:09 | 00:56:42 | 00:43:09 | 02:00:00 |
| 19 | 21 | Howarth, Peter | Met Police Tri | 45/46 | M | 00:20:17 | 01:02:46 | 00:37:00 | 02:00:03 | |
| 20 | 39 | Turvey, Mike | Tri London | 35 | M | 00:20:45 | 01:02:55 | 00:37:01 | 02:00:41 | |
| 21 | 31 | Rea, Sean | 37 | M | 00:23:20 | 01:02:11 | 00:35:44 | 02:01:15 | ||
| 22 | 60 | Saulius, Narbuitas | 33 | M | 00:21:15 | 01:07:44 | 00:32:21 | 02:01:20 | ||
| 23 | 56 | Wrezesien, Tom | Brewed Force | 30 | M | 00:21:59 | 00:59:40 | 00:40:12 | 02:01:51 | |
| 24 | 11 | Hacking, Steve | 35 | M | 00:20:24 | 01:04:23 | 00:37:11 | 02:01:58 | ||
| 25 | 54 | Brocker, David | Serpentine RC Tri | 33 | M | 00:20:48 | 01:04:44 | 00:38:49 | 02:04:21 | |
| 26 | 26 | Hopgood, Kevin | 39 | M | 00:21:01 | 01:07:04 | 00:37:30 | 02:05:35 | ||
| 27 | 24 | Thomas, Bob | Hillingdon Tri Stars | 60 | SV | M | 00:22:07 | 01:03:02 | 00:40:36 | 02:05:45 |
| 28 | 58 | Van Doimen, Clive | 38 | M | 00:23:41 | 00:56:29 | 00:46:28 | 02:06:38 | ||
| 29 | 41 | Taylor, Alan | 27 | M | 00:20:30 | 01:06:22 | 00:40:04 | 02:06:56 | ||
| 30 | 7 | Bing, Steve | 33 | M | 00:21:49 | 01:04:45 | 00:41:46 | 02:08:20 | ||
| 31 | 55 | Cates, Paul | 40 | M | 00:19:15 | 01:14:21 | 00:35:19 | 02:08:55 | ||
| 32 | 30 | Fowler, Jeff | Walthamstow Athletics Club | 48 | V | M | 00:21:16 | 01:09:32 | 00:38:59 | 02:09:47 |
| 33 | 3 | Jackson, Clive | Tri Sport Epping | 43/44 | V | M | 00:23:28 | 01:03:57 | 00:43:24 | 02:10:49 |
| 34 | 53 | Clarke , Stuart | M | 00:20:57 | 01:08:33 | 00:42:31 | 02:12:01 | |||
| 35 | 38 | Pendleton, Nick | Met Police Tri | 45/46 | V | M | 00:22:32 | 01:07:05 | 00:42:33 | 02:12:10 |
| 36 | 33 | O'Loughlin, Andrew | 30 | M | 00:21:31 | 01:10:30 | 00:40:26 | 02:12:27 | ||
| 37 | 22 | Jefford, Mark | 38 | M | 00:18:48 | 00:59:54 | 00:57:12 | 02:15:54 | ||
| 38 | 18 | Stoll, Robert | 43 | V | M | 00:25:25 | 01:04:15 | 00:47:27 | 02:17:07 | |
| 39 | 34 | Goodwin, Jim | 44 | V | M | 00:23:11 | 01:09:59 | 00:44:15 | 02:17:25 | |
| 40 | 43 | Hands, Ken | 36 | M | 00:22:03 | 01:13:46 | 00:43:51 | 02:19:40 | ||
| 41 | 50 | Hull, Philip | 53 | SV | M | 00:24:21 | 01:12:56 | 00:44:23 | 02:21:40 | |
| 42 | 49 | Johnson, Simon | Serpentine RC Tri | 28 | M | 00:24:21 | 01:14:42 | 00:44:32 | 02:23:35 |
| Pos | # | Name | Club | Age | Cate | Sex | Run 1 | Bike | Run 2 | Total |
| 1 | 46 | Gribble, Emmie | Serpentine RC Tri | 31 | F | 00:20:29 | 01:04:23 | 00:35:42 | 02:00:34 | |
| 2 | 44 | Glew, Chris | Kingfisher Tri | 49 | V | F | 00:24:30 | 01:04:42 | 00:44:17 | 02:13:29 |
| 3 | 42 | Jansz, Nicole | Walden Tri | 34 | F | 00:24:25 | 01:09:15 | 00:40:42 | 02:14:22 | |
| 37 | Stewart, Sarah | Tri Sport Epping | 33 | F | 00:25:25 | DNF |
| Pos | # | Name | Club | Sex | Total |
| 1 | 12 | Branch, Raymond | Team Viper | M | 00:43:52 |
| 2 | 9 | Kelly, Christopher | Leaside (Canoe) | M | 00:44:41 |
| 3 | 11 | Ragouzardis, Alice | Bodyworks XTC | F | 00:45:01 |
| 4 | 14 | Beeton, Aart | M | 00:46:32 | |
| 5 | 1 | Stracey, Syreeta | Crystal Palace Triathletes | F | 00:46:48 |
| 6 | 7 | Dimech, Christine | Greenwich Tritons | F | 00:49:08 |
| 7 | 8 | Powell, Emma | F | 00:57:35 | |
| 8 | 3 | Hitching, Helen | F | 01:04:41 | |
| 8 | 4 | Wells, Pete | M | 01:04:41 | |
| 10 | 13 | Mason, Daniel | Leaside (Canoe) | M | 01:05:39 |
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