It was suggested at the time that Cameron was planning to hold the referendum in October 2016, but the European Union Referendum Act 2015, which authorised it, went before the House of Commons the following day, just three weeks after the election.
Waktu itu Cameron diperkirakan akan mengadakan referendum bulan Oktober 2016, tetapi UU Referendum Uni Eropa 2015 diteruskan ke House of Commons keesokan harinya, tiga pekan setelah pemilu.