The 45 minute episode, titled The Agreement, picks up a year on from the end of series three and focuses around the Good Friday Agreement referendum, which brought widespread peace and stability to Northern Ireland after decades of bloodshed.

As the broadcaster explains further: “For this special instalment we return to Derry one year later as the gang prepare for their final year of school. It’s the week of the referendum on the Good Friday Agreement and its timing couldn’t be any worse as the highlight of the year, Erin and Orla’s joint 18th birthday party, threatens to be overshadowed. While the family try to get their heads around the possible outcomes of the vote, the gang realise that they may not be ready for what the future holds.”

Derry Girls season 3: Channel 4 have just announced a special extra episode following the finale