According to the author’s biographical information for Quidditch Through the Ages, Whisp is a Wanderers fan (QA).
Lexicon list of Quidditch books
From the Web
Writing by J K Rowling on Pottermore: The Daily Prophet
- The British and Irish Quidditch League
- British and Irish Quidditch teams to support
- Quidditch collection
Harry Potter Wiki: Wigtown Wanderers