Original Star Wars cast members Mark Hamill and Harrison Ford are in London where shooting has just begun for the new trilogy of the sci-fi classic. Meanwhile, Carrie Fisher has confirmed her dog, Gary, is in the British capital too.

However, Disney, who bought the rights to Star Wars $4.05 billion in 2012, and director JJ Abrams have refused to confirm the involvement of the three key cast members in the new movie.

Entertainment Weekly reports that Hamill and Ford are in London and British actor Peter Serafinowicz, who voiced Darth Maul in The Phantom Menace, tweeted a shot of himself with Hamill in the capital on Monday.

"Met up with @HamillHimself in London today. I wonder why he's here," he wrote.

Fisher, who played Princess Leia in the first Star Wars movies, tweeted: "So my dog Gary has been spotted in London, but apparently without me," wrote the actor and comedian. "Who has he been seeing? Let me know if you have any clues."