Are there many harry potter sights in London?

http://www.walks.com/London_Walks_Home/Harry_Potter/default.aspx london walks ( a walking tour company) has 2 harry potter walks. the walks are cheap ( 8 pounds sterling)and you'll get all the info you need. much better than looking for the places your self.

yeah kings cross station, the millenium bridge (in half blood prince everyone runs as it starts shaking when those evil things are there) the thames water where harry and friends fly over on their broomsticks, i THINK a building that opens up for them (i wont name it as i do not know what it is called lol)

A mixture! You won't see the Leaky Cauldron, or Diagon Alley, for instance. But parts of London were shown throughout the films. Here's some more detail: "In the first film, Harry first realizes his wizard powers when talking with a boa constrictor, filmed at the London Zoo's Reptile House in Regent's Park (Tube: Great Portland Street). London bustles along oblivious to the parallel universe of wizards, hidden in the magical Diagon Alley (filmed, like many of the other fictional settings, on a set at Leavesden Studios, north of London). The goblin-run Gringotts Wizarding Bank, though, was filmed in the real-life marble-floored Exhibition Hall of Australia House (Tube: Temple), home of the Australian Embassy. Harry catches the train to Hogwarts at King's Cross Station. Inside the glass-roofed train station, on a pedestrian sky bridge over the tracks, Hagrid gives Harry a train ticket. Harry heads to platform 9¾. You'll find a fun re-creation — complete with a Platform 9¾ sign and a luggage cart that appears to be disappearing into the wall — on the way to platform 9. (Walk towards the pedestrian bridge and make a left at the arch.) In film #3, Harry careens through London's lamp-lit streets on a purple three-decker bus that dumps him at the Leaky Cauldron. In this film, the pub's exterior was shot on rough-looking Stoney Street at the southeast edge of Borough Street Market, by The Market Porter pub (Tube: London Bridge). In film #5, the Order of the Phoenix takes to the sky on broomsticks over London, passing by plenty of identifiable landmarks at night. Far beneath them glow the London Eye, Big Ben, and Buckingham Palace. Cinema buffs can visit Leicester Square (Tube: Leicester Square), where Daniel Radcliffe and other stars strolled past paparazzi and down red carpets to the Odeon Theater to watch the movies' premieres." http://www.ricksteves.com/plan/destinations/britain/hpotter.htm Here's more, including Grimmauld Place: http://www.hp-lexicon.org/essays/essay-in-search-of-grimmauld-place.html