Star Wars 7: Harrison Ford, Mark Hamill and Carrie Fisher Assemble in London

The original stars of George Lucas' Star Wars saga have arrived in London ahead of the start of full production on J.J. Abrams' Star Wars: Episode VII.

Harrison Ford, Carrie Fisher and Mark Hamill have been pretty open about reprising their roles as Han Solo, Princess Leia and Luke Skywalker after a 32-year absence.

Each has been spotted or admitted to being in London, though none of them has confirmed why. At the moment there has been no official casting announcement from LucasFilm, but it is generally accepted that it will be happening.

Harrison Ford was spotted in late April outside the Hakkasan restaurant in London and was seen on Saturday talking to crew members from London Air Ambulance. Ford is known to be an aircraft enthusiast.

Carrie Fisher has been open about her involvement, playing around with the media in typical fashion. She has also admitted that she'll be heading to London for six months to make the film. She also tweeted the following, continuing her trend of joking around.

Finally there's Mark Hamill, who comedian Peter Serafinowicz happened across in London. Serafinowicz provided the voice of Star Wars: Episode 1 villain Darth Maul (no, he won't be back) and posted the following the picture.

Official casting for the film has yet to be announced, but with production starting imminently the big announcement is expected this Sunday (4 May) due to the significance of that date with Star Wars fans and it having been designated Star Wars Day.

Star Wars: Episode VII will be released on 18 December 2015.