| Event | 2015 Brooks Snowdonia - Marathon |
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| Name | Derek Williams | Club | Race Number | 1853 | Date | 24/10/2015 | |
| Gender | Male | Gender Position | 490 of 1386 | Category | M50+ | Category Position | 41 of 179 |
| Pen y Pass | 00:40:23 | Stage Position | 515 |
| Halfway | 01:48:44 | Stage Position | 402 |
| 23 Miles | 03:21:13 | Stage Position | 529 |
| Gun Time | 03:58:30 | Overall Position | 543 |
| Chip Time | 03:58:10 | Chip Position | 566 |