| Title | Weekend | Week | Total | % Change | Total Weeks |
| 1 (new) |  | Step Brother's (2008) | £1,681,492 | £1,681,492 | £1,681,492 | new | 1 |
| 2 (2) |  | Mamma Mia! (2008) | £1,548,894 | £4,279,500 | £54,541,447 | -16% | 8 |
| 3 (new) |  | The Strangers (2008) | £1,250,624 | £1,250,624 | £1,250,624 | new | 1 |
| 4 (1) |  | Hellboy II: The Golden Army (2008) | £1,025,449 | £2,676,779 | £5,646,381 | -65% | 2 |
| 5 (4) |  | The Dark Knight (2008) | £908,618 | £2,289,248 | £45,787,563 | -38% | 6 |
| 6 (3) |  | Get Smart (2008) | £710,174 | £1,951,601 | £3,493,606 | -54% | 2 |
| 7 (new) |  | Babylon A.D. (2008) | £536,968 | £536,968 | £536,968 | new | 1 |
| 8 (5) |  | You Don't Mess With the Zohan (2008) | £420,761 | £1,208,857 | £4,769,239 | -46% | 3 |
| 9 (7) |  | Wild Child (2008) | £389,247 | £1,164,633 | £4,197,566 | -34% | 3 |
| 10 (8) |  | WALL•E (2008) | £360,110 | £971,613 | £21,483,558 | -22% | 7 |
| 11 (6) |  | The Mummy: Tomb of the Dragon Emperor (2008) | £324,195 | £981,788 | £10,973,278 | -49% | 4 |
| 12 (9) |  | Star Wars: The Clone Wars (2008) | £206,771 | £603,761 | £2,518,826 | -41% | 3 |
| 13 (10) |  | Space Chimps (2008) | £109,574 | £312,181 | £3,148,739 | -19% | 5 |
| 14 (11) |  | Kung-Fu Panda (2008) | £97,027 | £294,688 | £19,634,723 | -25% | 9 |
| 15 (new) |  | The Wackness (2008) | £80,581 | £80,581 | £80,581 | new | 1 |