This month marks the 20th anniversary of the release of the first Harry Potter film, Harry Potter and the Philosopher's Stone.

The occasion has been marked with great fanfare and a TV special is being planned, which will see the three main stars - Daniel Radcliffe, Rupert Grint and Emma Watson - reunited to talk through their careers on the blockbusting series.

Meanwhile cinemas have been celebrating the anniversary with fresh screenings of the film.

Back in November 2001, the movie opened amid huge excitement from fans.

It was based on the first Harry Potter book by J.K Rowling which was published in 1997.

At screenings young readers turned up dressed as their favourite characters, with queues of young wizards appearing outside cinemas.

Here is a selections of photos from the time - and from subsequent book and film releases - showing how Potter fans marked the occasion.

%image(15620654, type="article-full", alt="Harry Potter crazy Celia Durrant former worker at UCI Riverside with Buttercup the ferret. Ferrets for the movie were supplied by PACT.")

%image(15620656, type="article-full", alt="The Harry Potter trilogy books.")

%image(15620657, type="article-full", alt="Daphne Knoghts outside Langleys with the Lego Harry Potter castle.")

%image(15620658, type="article-full", alt="Olivia Hampson was a big Harry Potter fan and had one of her books signed by the cast of the film.")

%image(15620659, type="article-full", alt="Alan Staton from Bertram Books in Norwich with one of the Harry Potter books.")

%image(15620660, type="article-full", alt="Kids dressed up as Harry Potter characters at the screening of the Harry Potter movie.")

%image(15620661, type="article-full", alt="Staff at Cinema City in Norwich celebrated the premier of Harry Potter with fancy dress, quizzes and other things. Zoe Saber looking after the sweets. Pictured in 2009.")

%image(15620663, type="article-full", alt="Staff at Cinema City in Norwich celebrated the premier of Harry Potter with fancy dress, quizzes and other things. Pictured is cinema-goers dressed up as Hogwarts castle in 2009.")

%image(15620665, type="article-full", alt="Jim Stevenson, former team leader in Jarrold's toy department with Harry Potter Products.")

%image(15620667, type="article-full", alt="Lucy Clark and Jake Brown, winners of the Harry Potter fancy dress. Pictured before the preview shooting.")

%image(15620669, type="article-full", alt="Daniel Rose from Barnby who is to audition for a part in the new Harry Potter film.")

%image(15620671, type="article-full", alt="Queue of about 25 people at 8am at Waterstones in the Royal Arcade, Norwich for the new Harry Potter book in 2000.")

%image(15620672, type="article-full", alt="The first customers in the queue of about 25 people at Waterstones in the Royal Arcade, Norwich for the new J K Rowling book, Harry Potter and the Goblet of Fire. Pictured in 2000.")

%image(15620673, type="article-full", alt="Waterstones, Norwich, and brothers Maxim, eight, and Edward Field, nine, from Beetley near Dereham, are already on the second and third chapters of the new J K Rowling book, Harry Potter and the Goblet of Fire.")

%image(15620675, type="article-full", alt="Fans ready for the Harry Potter film trailer are fans (left) Flora McNerney and her brother Jamie. Pictured in 2001.")

%image(15620677, type="article-full", alt="Chris Rankin, with his Harry Potter script. He acted as Percy Weasley. Pictured in 2001.")

%image(15620678, type="article-full", alt="Foster Carer Sheila Kemp, with her granddaughters dressed up as Harry Potter.")

%image(15620679, type="article-full", alt="Friends (left to right) Aime McNeely, Jamie McNerney, Lara McNeely and Flora McNerney displaying their UCI cinema tickets for Harry Potter and the Philosopher's Stone in 2001.")

%image(15620680, type="article-full", alt="Harry Potter book launch at Borders, Chapelfield, Norwich. Pictured in 2007.")

%image(15620683, type="article-full", alt="Harry Potter book launch at Borders, Chapelfield, Norwich. Pictured in 2007.")

%image(15620684, type="article-full", alt="Harry Horsman and Martin Kleinhams que up for the fancy dress parade at the Forum for the Harry Potter book night party. Pictured in 2003.")

%image(15620685, type="article-full", alt="Harry Potter film review, Katie James.")

%image(15620686, type="article-full", alt="Harry Potter fans queueing outside Ottakers in Norwich for the release of the new book. Pictured in 2003.")

%image(15620687, type="article-full", alt="Harry Potter book reviewer Loe Donnachie at Waterstones, Norwich. Pictured in 2003.")

%image(15620689, type="article-full", alt="Tyler and Olivia Smith at the Harry Potter film review.")

%image(15620690, type="article-full", alt="The new Harry Potter books arriving at the Norwich Waterstones shop in 2003.")

%image(15620691, type="article-full", alt="Staff at the Odeon, Daniel Blackburn (kneeling), Celia Durrant and Daniel Elliott dressed up as Harry Potter for the latest Harry Potter film premiere at the Odeon Cinema in Norwich. Pictured in 2007.")

%image(15620693, type="article-full", alt="Edward Jenkins and his grandson Joshua Jenkins.")

%image(15620694, type="article-full", alt="Kyle Harper and his guests at the Harry Potter film preview showing.")

%image(15620695, type="article-full", alt="Harry Potter, 4, from Mattishall, who shares the same name as the character of the much hyped film - pictured with many Harry Potter books in 2001.")

%image(15620696, type="article-full", alt="Phoebe York, 8, won four tickets to see a exclusive free advance screening of the new Harry Potter film called " The Philosopher's Stone".")

%image(15620697, type="article-full", alt="From left to right: Tracey Moffat, Andrew Barkell and Louise Conneely protecting the boxes of new Harry Potter books in WHSmith. Pictured in 2000.")

%image(15620698, type="article-full", alt="Katie Andrews, 7, reads Harry Potter. Picture taken at Ottakars book store, Norwich, in 2003.")

%image(15620699, type="article-full", alt="First in the queue to buy the latest Harry Potter novel form Waterstones was nine-year-old Matthias Auton. He was rewarded with a T-shirt and posted.")

%image(15620701, type="article-full", alt="Cate Parker with Flora and Jamie McNerney with their Harry Potter novels outside Waterstones in Norwich.")

%image(15620702, type="article-full", alt="Olivia Hampson was a big Harry Potter fan who had one of her books signed by the cast of the film.")