Banksy Subjects UK Voters to Potential Criminal Prosecution

I have never written about UK law before, but I couldn't resist this, especially since it involves Banksy, subject of the intriguing 2010 film, "Exit Through the Gift Shop." Apparently, Banksy recently offered to send voters in certain districts this free print in exchange for proof that they had voted against the Conservative candidate in their district. After being warned that he had subjected any takers to potential criminal prosecution for electoral fraud and that his offer had the potential to invalidate election results, Banksy rescinded the offer. How about that? I guess politicians' promises to voters (whether or not they are ultimately kept) don't count as bribery.