In the 2000s, Chrissie Jackson's partner Ivan booked a villa just outside of Skiathos. Because they needed to pay the full deposit, Chrissie asked her ex-husband Alan Jackson for money. (TV: Invasion of the Bane)
Behind the scenes
Though not clarified by Invasion of the Bane, Skiathos is the name of both a Greek island and a town on the island. As just outside of the island would be somewhere in the Aegean Sea, it can be inferred from context Chrissie is referring to the town.