The one-off episode focuses on a family who decide to travel to Margate to have their summer holiday in December.
The BBC explains: "2020 has been an absolute nightmare for the Jessop family (amongst others). Having seen their finances and future plans devastated, they've also had to abandon their holiday of a lifetime to California. With family morale at an all-time low, the Jessops decide they're going to have their summer holiday after all, even if it means doing it in December. In Margate.
Comedy veteran Alison Steadman (pictured) takes on the role of grandmother Sue, with Plebs co-creator Tom Basden - who has also written the script for Pandemonium - as Robin. Tori Allen-Martin plays Cherry.
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