According to our Seller Policies:

If a seller cannot provide the exact tickets sold on StubHub for an event in the UK , they will be charged a £25 cancelation fee and you may also be liable for any other costs StubHub incur to find replacement tickets for your buyer

If a seller cannot provide the exact tickets sold on StubHub for an event in the European Economic Area (and any countries besides the US or Canada), they may be charged the total cost of tickets sold, as well as any replacement, delivery, or administrative fees associated with rectifying the issue.