Bulgaria
But when there's a choice of Regular departures from the likes of Stansted and Gatwick, why would people local to Southend plan their week in Bulgaria around some one off date or two out of season. It was probably a lot cheaper to fly from one of the other London airports too. These 'irregular' charters work great from the regional airports that have little competition from being an hour plus from another major airport, but Southend really is competing with the other London 'Big Boys' IMHO and therefore people will still travel to another departure point to save a £ or two and travel on a date that suits them.