Britain’s Conservative Party has delayed sending out ballot papers for its leadership election over security concerns. The party has made changes to its process on the advice of the National Cyber Security Centre, part of Britain’s intelligence and security headquarters at GCHQ, following warnings that hackers could change members’ votes. Under the party’s original system, members would be able to vote but change their decision while the ballot remained open but now a unique code will be provided which will only allow one, unchangeable vote. The ballots had been due to be sent out on Monday but could now arrive as late as Thursday, August 11.