It may look more like Glastonbury or an annual convention of Native Americans, but a field near Watford is home to the latest Harry Potter film.

The tents are believed to feature as a village in the fourth film in the series about JK Rowling's boy wizard, who will again be played by Daniel Radcliffe.

With the production shrouded in secrecy, the cast and crew are currently working at Leavesden Studios, near Watford, on the adaptation of Harry Potter and the Goblet of Fire.

Leavesden has been the main studio site for the three previous Harry Potter films as well as other blockbusters such as the James Bond film Goldeneye.

The fourth film, due for release in November next year, is set to feature a cameo appearance from Jarvis Cocker with the former Pulp singer writing the soundtrack.

Mercury music prize winners Franz Ferdinand have been tipped as the leading candidates for a "wizard band" who appear in the film.