Teams Theo Brown played for
| Second Eleven Championship | Derbyshire Second XI (2026) |
| Derbyshire Premier League | Swarkestone (2024-2026) |
| Under-14 County Cup | Derbyshire Under-14s (2024) |
| Under-18 County Cup | Derbyshire Under-18s (2026) |
| Under-18 County Championship | Derbyshire Under-18s (2026) |
| Under-18 Twenty20 | Derbyshire Under-18s (2026) |
| Miscellaneous | Swarkestone Under-12s (2019) |
| Swarkestone Under-13s (2019-2024) | |
| Swarkestone Under-15s (2020-2026) | |
| Swarkestone Under-13s A (2022-2024) | |
| Swarkestone Under-17s (2022-2026) | |
| Swarkestone Third XI (2023-2024) | |
| Swarkestone Under-15s A (2023) | |
| Swarkestone Second XI (2024-2026) | |
| Swarkestone (2024-2026) | |
| Derbyshire Under-16s (2025-2026) | |
| ECB Midlands Under-15s (2025-2026) | |
| Derbyshire Under-18s (2026) | |
| Repton School (2026) |
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