Teams William Spencer played for
| Minor Counties Championship | Hertfordshire (2008) |
| Home Counties Premier League | Harpenden (2011-2012) |
| Under-15 County Cup | Hertfordshire Under-15s (2002) |
| Cricketer Cup | Harrow Wanderers (2008-2016) |
| Miscellaneous | Harrow School (2003-2007) |
| Hertfordshire Under-15s (2003) | |
| Marylebone Cricket Club Young Cricketers (2004) | |
| Harpenden (2007-2008) | |
| Hertfordshire Development XI (2007-2009) | |
| Hertfordshire (2009) | |
| Marylebone Cricket Club (2009-2015) | |
| I Zingari (2014-2016) | |
| Harrow Wanderers (2016) |
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