FILMING has started on the sixth Harry Potter movie at Gloucester Cathedral.
Cast and crew are on site at the historic building this morning, which doubles as the Hogwarts School of Witchcraft and Wizardry.
Stars already spotted arriving include Daniel Radcliffe, who plays Harry Potter, and Rupert Grint, who plays Ron Weasley.
They arrived on set at around 10am, accompanied by Alan Rickman, who plays Professor Snape, Dame Maggie Smith, who plays Professor McGonagall, and Tom Felton, who plays Draco Malfoy.
Also spotted were a number of doubles - lookalikes including Ron Weasley and Draco Malfoy.
Reporter Kate Nicholls managed to get a quick look behind the scenes - and saw crew busy making magical potions ready for the filming of the sixth book in the series - Harry Potter and the Half Blood Prince.
She said: "I saw them pouring vividly-coloured soup into bowls, with different food colourings ready to be added. It looked as though they could only be getting potions ready."
There are 174 local children on site, who will be appearing as extras in the filming, and more than 200 crew members at the Cathedral.
A blue-screen has been erected in the Cathedral's cloisters to help with the computer generated effects which will be added later.
Two sets of crutches were also spotted arriving at the set - leading to speculation the scenes after Ron falls from his broom in a game of quidditch could be being filmed.
It is believed filing will go on until 7pm tonight, and will be finished at the Cathedral by the end of tomorrow.
hp sauce & hbpmoviepics