By SARAH BULL and CHRIS PARSONS
Bringing the films to life: Boris Johnson walks down Diagon Alley
It is likely to be an attraction which will pull in huge crowds of children and adults alike, and has even been approved by the Mayor of London.
The grand unveiling of the Harry Potter set at Leavesden Studios in Hertfordshire was marked with the help of Boris Johnson, and will be open to other British muggles in March 2012.
The studio features landmarks from the Harry Potter series such as Dumbledore's office at Hogwarts and Ollivander's wand shop in Diagon Alley.
Magic touch: The Mayor brandishes a wand from the famous Ollivander's store
The 150,000 sq ft exhibition was described as a 'magical opportunity' for fans to see what went into making the films by Mr Johnson as he toured the set and even tried out a wand.
Mr Johnson said during the visit to the studio: 'I'm very excited to be here- its incredible to see the genius and ability of the people who made these sets. I have a feeling its going to be a huge success.
Immersed in the story: Muggles will be able to follow in Harry Potter's footsteps from March 2012
Boris Johnson treads the cobbles in Diagon Alley
Rupert Grint, who played Harry's sidekick Ron Weasley in the films. said: 'The sets all have tiny details that you may not notice in the films but when you walk through them you can feel the work that's gone into it. It's amazing.'
As well as Diagon Alley and Dumbledore's office, muggles will also be able to walk the stone floor of the Great Hall at Hogwarts and even sneak into the Gryffindor common room as well as see the cupboard under the stairs where harry was sent in Privet Drive.
Josh Berger, head of Warner Bros in the UK, said: 'I am thrilled to be bringing this iconic set to the world. We are incredibly proud.'
American cousin: The Wizarding World of Harry Potter in Florida was the first attraction dedicated to the boy wizard
Up to 100 of the original painters and carpenters from the films have been involved in putting together the set in it new location.
Mr Johnson may have had bigger things on his mind, however, as just a few miles away in Dunstable one of his new Routemaster-style buses was experiencing a few teething problems on the M1.
The stricken double-decker was spotted coming to a standstill on the motorway near Dunstable today because of a flat battery.