TUI TUI TUI is an acronym for Touristik Union International ("Tourism Union International"). TUI AG was known as Preussag AG until 1997 when the company changed its activities from mining to tourism. It is headquartered in Hanover, Germany. https://en.wikipedia.org › wiki › TUI_Group TUI Group - Wikipedia No deposit holidays for 2022 are back , BOOK WITH £0 DEPOSIT USING DIRECT DEBIT. No deposit holidays are valid on holidays departing from March 2022. T&Cs Apply. There is no extra charge for using the TUI no deposit holiday direct debit scheme.