At the heart of the special, as ever, will be put-upon couple Beth (Arabella Weir) and Eric (Alex Norton) hoping to have a quiet festive feast on their own.

But this Christmas bonus will see Cathy (Doon Mackichan) and Colin (Jonathan Watson) turn up, their trip to the French Alps having been thwarted by a cancelled flight.

Neighbour Christine (Elaine C Smith) piles in too with granddaughter Madison, after daughter Sophie is delayed in Paris by the same disruption.

While Beth and Eric’s son Ian (Jamie Quinn), over with new boyfriend Gordon (Kieran Hodgson) to drop off presents, admits their other plans have fallen through… and asks if they can stay on for dinner. With a meal for two now stretching to six, Christine and Cathy reveal their own particular take on the spirit of christmas.

The festive special will be followed by the new six-part series early in 2018, where it will be revealed that Christine’s daughter Sophie, who has been played by Sharon Rooney, has taken baby daughter Madison to live with a new boyfriend in Wales.

New characters in the new series will include Gordon, played by Edinburgh Comedy Award Kieran Hodgson, who played Ian Lavender in We’re Doomed: The Dad’s Army Story. Scottish wrestling and comic phenomenon Grado, whose real name is Graeme Stevely (Scot Squad, River City), will also be making a guest appearance in the series alongside Joy McAvoy (Filth, Stonemouth).

Shane Allen, BBC Controller, Comedy Commissioning, says: “Two Doors Down precisely captures the raucous comedy voice of modern Scotland with these terrific characters and has become a firm favourite with the BBC Two audience.”

The new series is currently filming on location in the Glasgow area and at BBC Scotland’s Dumbarton Studios.