| Personal Details | |
| Name | Sebastian Armstrong |
| Known As | Sebby |
| Year of Birth | 2012 |
| Eligibility Category | Open/Male |
| Membership Details | |||
| Member Number | 1470316 | ||
| Member Status | Current | ||
| Ranked Club | Boldmere Swimming and Water Polo | ||
| Country of International Representation | England | ||
| Membership Categories |
| SE Club Compete |
| Clubs & Organisations | |
| Club | Ranked |
| Boldmere Swimming and Water Polo | Yes |
| Click For Personal Best | 2024 Short Course | Short Course PB | 2024 Long Course | Long Course PB |
| 50m Freestyle | 34.75 | 34.75 | . | . |
| 100m Freestyle | . | 1:20.26 | . | . |
| 200m Freestyle | . | 2:58.28 | . | . |
| 400m Freestyle | . | 6:43.33 | . | . |
| 800m Freestyle | . | . | . | . |
| 1500m Freestyle | . | . | . | . |
| 50m Breaststroke | 42.81 | 42.81 | 45.50 | 45.50 |
| 100m Breaststroke | 1:35.47 | 1:35.47 | 1:36.49 | 1:36.49 |
| 200m Breaststroke | 3:27.64 | 3:27.64 | 3:25.23 | 3:25.23 |
| 50m Butterfly | 50.98 | 50.32 | . | . |
| 100m Butterfly | . | . | . | . |
| 200m Butterfly | . | . | . | . |
| 50m Backstroke | 40.70 | 40.70 | 43.09 | 43.09 |
| 100m Backstroke | . | 1:31.32 | . | . |
| 200m Backstroke | . | 3:17.02 | . | . |
| 200m Individual Medley | . | 3:19.20 | . | . |
| 400m Individual Medley | . | . | . | . |
| 100m Individual Medley | 1:31.52 | 1:31.52 | . | . |
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