Русско-англо-русский юридический словарь

"Anything else runs the risk of not being counted, and considered a spoiled ballot paper." (BBC News)

If you damage or lose your ballot paper, you can remedy this by taking the spoiled ballot paper, if you have it, and the rest of the pack that was sent to you to your local polling station where you can receive a replacement ballot paper up until 5pm on election day. (The Star)

“I will support the @brexitparty_uk in the EU elections, but until then a spoiled ballot paper was the only option.” (The Independent)