| Europa League 2010/2011 - Appearances as Referee |  |
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 |
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| 24/02/2011 | Bayer Leverkusen | - | Metalist Kharkiv | 2:0 | 2 | - | - |
| 17/03/2011 | Paris Saint-Germain | - | SL Benfica | 1:1 | 4 | - | - |
| 14/04/2011 | FC Twente | - | Villarreal CF | 1:3 | 3 | - | 1 |
| Europa League 2010/2011 - Appearances as Referee | |
|
|
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| 24/02/2011 | Bayer Leverkusen | - | Metalist Kharkiv | 2:0 | 2 | - | - |
| 17/03/2011 | Paris Saint-Germain | - | SL Benfica | 1:1 | 4 | - | - |
| 14/04/2011 | FC Twente | - | Villarreal CF | 1:3 | 3 | - | 1 |
| Complete name: | William Collum |
| Born: | 18/01/1979 |
| Place of birth: |
Glasgow, 
Scotland |
| Residence: | Motherwell |
| Nationality: |
Scotland |
| Profession: | Lehrer |
| Height: | 174 cm |
| Weight: | 69 kg |