SegaWorld London opened to the public on 7 September 1996. Was Sega’s first indoor theme park outside of Japan, became their flagship venue in Europe, and occupied a total area of 10200m² on seven floors of the London Trocadero complex. Cashflow issues largely caused by mismanagement of various aspects and poor reviews forced Sega to pull out of the venue under contract exactly three years after opening, with the floors latterly becoming the ownership of Family Leisure, operators of the Funland arcade situated elsewhere in the Trocadero. Officially became known as Funland in February 2000, which subsequently downsized in September 2002 and closed permanently on 4 July 2011 after further mismanagement problems. (Wiki)
Visited by 6-7 years old me at least ten times when I was living in Trafalgar Square, chilling at Canada House.