| Title | Weekend | Week | Total | % Change | Total Weeks |
| 1 (new) |  | National Treasure: Book of Secrets (2008) | £2,483,297 | £2,483,297 | £2,483,297 | new | 1 |
| 2 (new) |  | Juno (2007) | £2,002,120 | £2,002,120 | £2,002,120 | new | 1 |
| 3 (1) |  | Cloverfield (2008) | £1,652,549 | £3,218,465 | £6,704,421 | -53% | 2 |
| 4 (2) |  | Sweeney Todd: The Demon Barber of Fleet Street (2007) | £765,992 | £1,605,068 | £9,578,313 | -55% | 3 |
| 5 (new) |  | The Water Horse: Legend of the Deep (2008) | £760,340 | £760,340 | £760,340 | new | 1 |
| 6 (new) |  | Definitely, Maybe (2008) | £698,041 | £698,041 | £698,041 | new | 1 |
| 7 (3) |  | Over Her Dead Body (2008) | £574,521 | £1,038,145 | £2,033,835 | -42% | 2 |
| 8 (4) |  | Penelope (2008) | £425,543 | £624,925 | £1,394,765 | -45% | 2 |
| 9 (5) |  | No Country For Old Men (2008) | £411,113 | £823,950 | £4,756,882 | -42% | 4 |
| 10 (7) |  | Alvin and the Chipmunks (2007) | £219,273 | £265,997 | £9,504,576 | -53% | 8 |
| 11 (new) |  | There Will Be Blood (2008) | £215,490 | £215,490 | £215,490 | new | 1 |
| 12 (6) |  | P.S. I Love You (2007) | £196,228 | £493,461 | £10,313,211 | -63% | 8 |
| 13 (9) |  | Underdog (2008) | £148,339 | £199,360 | £530,274 | -55% | 2 |
| 14 (new) |  | The Diving Bell and the Butterfly (2008) | £106,911 | £106,911 | £106,911 | new | 1 |
| 15 (8) |  | St. Trinian's (2007) | £84,784 | £168,954 | £12,042,854 | -75% | 8 |