Two by-elections were held on the 20th October 2016 for the vacant seats of Batley and Spen and and Witney.
Batley and Spen had become vacant due to the tragic murder of Jo Cox in June. The seat was uncontested by the other parties out of respect to Jo and was won by Labour's Tracy Brabin with 85% of the vote.
Witney had become vacant following the resignation of David Cameron as MP in September. The seat was won by Conservative's Robert Courts with 45% of the vote.
These by-election results have been reflected in the following Postcode to Parliamentary Constituency products and have affected 11,553 Postcode records in total: 7,772 Postcodes in Witney and 3,781 Postcodes in Batley and Spen.