Apostulous Papadopolous is an unseen character, he has never appeared on screen.
In an episode dated 1 February 2016 its said that Andonis is no longer in charge of the Launderette but his son is Apostulous. Dot tells Tamwar Masood he's in Greece and from his uncle's funeral.
He was also mention 15 August 2016 by Dot mentioning that he will by dropping in to the Laundrette. But during this episode his name seem to be spelt differently Apostulos. And again in the episode 12 September 2016 his name is spelt Aposulous.