Studio Tour London – The Making of Harry Potter opened to the public in 2012 and has since welcomed up to 6,000 visitors a day during peak times.

[2] After the war, the aerodrome was purchased outright by de Havilland, who themselves had a succession of owners in the following decades but ultimately they and the site were acquired by Rolls-Royce.

Eon leased the site for the duration of their shoot and went about gutting the factories, turning them into stages, workshops and offices - in short a working film studio.

A succession of major feature films made use of the site, including the first of the Star Wars prequels, The Phantom Menace, and Tim Burton's Sleepy Hollow.

[6] As the eighth and final film, Harry Potter and the Deathly Hallows – Part 2, was nearing completion, in 2010, Warner Bros. announced their intention to purchase the studio as a permanent European base.

In 2010, as the final film was nearing completion, Warner Bros. announced they would be purchasing Leavesden Studios and work on the tour began.

Sets include the Great Hall, Dumbledore's office, Diagon Alley, the Ministry of Magic, the Gryffindor common room and boys' dormitory, Hagrid's hut and a 1:24 scale model of the Hogwarts castle (used for exterior shots).

[19] Instead, visitors get a chance to see up close the detail and effort that goes into a major feature film at the scale of the Harry Potter series.

[22] Warner Bros. has continued to put on special features for the school holidays, such as Dark Arts[23] and Animal Actors,[24] at no extra cost to visitors.

[25] In January 2015, the attraction's first expansion was announced - a brand new Platform 9¾ section, where visitors are able to board the original carriages behind the Hogwarts Express steam engine used in the films.

The setup includes the steam locomotive used in the films GWR 4900 Hall class no 5972 Olton Hall (wearing Hogwarts Castle nameplates) and the British Rail Mark 1 carriage that appeared in the films, brought to life by John Richardson's special effects team.

[31] On 1 July 2022, the Professor Sprout's Greenhouse expansion opened, as part of a new feature titled "Mandrakes and Magical Creatures".