| Title | Weekend | Week | Total | % Change | Total Weeks |
| 1 (new) |  | The Time Travelers Wife (2009) | £1,410,333 | £1,410,333 | £1,410,333 | new | 1 |
| 2 (new) |  | Aliens In the Attic (2009) | £1,323,575 | £1,323,575 | £1,323,575 | new | 1 |
| 3 (4) |  | G Force (2009) | £941,848 | £2,632,917 | £8,904,247 | -23% | 3 |
| 4 (3) |  | Harry Potter and the Half Blood Prince () | £932,745 | £2,390,009 | £46,766,825 | -31% | 5 |
| 5 (2) |  | G.I. Joe: The Rise of Cobra () | £827,389 | £2,158,244 | £3,867,004 | -52% | 2 |
| 6 (1) |  | The Ugly Truth () | £809,390 | £2,105,263 | £4,081,306 | -59% | 2 |
| 7 (new) | | Bandslam (2009) | £628,957 | £628,957 | £628,957 | new | 1 |
| 8 (7) |  | Ice Age: Dawn of the Dinosaurs () | £508,915 | £1,390,863 | £32,415,015 | -17% | 7 |
| 9 (5) |  | The Proposal () | £445,689 | £1,310,902 | £10,367,556 | -41% | 4 |
| 10 (new) |  | A Perfect Getaway () | £418,703 | £418,703 | £418,703 | new | 1 |
| 11 (8) |  | Orphan () | £379,179 | £1,004,799 | £1,574,945 | -33% | 2 |
| 12 (6) |  | The Taking of Pelham 123 () | £324,239 | £865,027 | £4,317,199 | -51% | 3 |
| 13 (10) | | Coco Before Chanel (2009) | £178,341 | £473,324 | £1,530,936 | -29% | 3 |
| 14 (9) |  | The Hangover (2009) | £145,865 | £359,906 | £21,620,272 | -48% | 10 |
| 15 (new) | | Kaminey () | £111,954 | £111,954 | £111,954 | new | 1 |
| 16 (new) |  | Imagine That () | £109,722 | £109,722 | £109,722 | new | 1 |
| 17 (new) | | Life Partner () | £89,521 | £89,521 | £89,521 | new | 1 |
| 18 (new) | | Sin Nombre (2009) | £65,039 | £65,039 | £65,039 | new | 1 |
| 19 (15) |  | Moon (2009) | £48,984 | £125,559 | £1,006,329 | -36% | 5 |
| 20 (12) |  | Land of the Lost () | £39,198 | £711,976 | £2,121,974 | -79% | 3 |
| 21 (new) | | Pranzo Di Ferragosto (2009) | £22,349 | £22,349 | £22,349 | new | 1 |
| 22 (17) |  | Looking For Eric () | £2,747 | £0 | £1,279,398 | 7% | 10 |
| 23 (20) | | Skin () | £1,751 | £5,131 | £23,167 | -16% | 4 |
| 24 (18) | | Last Chance Harvey (2008) | £1,124 | £3,923 | £2,051,855 | -53% | 11 |
| 25 (24) | | The End of the Line () | £880 | £880 | £54,432 | 65% | 10 |
| 26 (re) |  | Telstar () | £711 | £711 | £65,525 | re | 8 |
| 27 (26) |  | In the Loop (2009) | £318 | £1,316 | £2,146,142 | 67% | 17 |