| Title | Weekend | Week | Total | % Change | Total Weeks |
| 1 (new) |  | The House Bunny (2008) | £894,188 | £894,188 | £894,188 | new | 1 |
| 2 (new) |  | Mirrors (2008) | £834,092 | £834,092 | £834,092 | new | 1 |
| 3 (1) |  | How to Lose Friends and Alienate People (2008) | £812,534 | £1,465,319 | £2,619,926 | -30% | 2 |
| 4 (2) |  | Taken (2008) | £790,670 | £1,423,048 | £4,527,090 | -28% | 3 |
| 5 (3) |  | Tropic Thunder (2008) | £550,361 | £994,587 | £7,759,726 | -44% | 4 |
| 6 (new) |  | City of Ember (2008) | £496,909 | £496,909 | £496,909 | new | 1 |
| 7 (4) |  | Mamma Mia! (2008) | £479,057 | £1,050,098 | £65,197,501 | -38% | 14 |
| 8 (6) |  | The Boy In the Striped Pajamas (2008) | £298,032 | £535,282 | £3,327,249 | -32% | 5 |
| 9 (8) |  | Brideshead Revisited (2008) | £193,417 | £499,388 | £874,658 | -48% | 2 |
| 10 (new) |  | Nights In Rodanthe (2008) | £193,318 | £193,318 | £193,318 | new | 1 |
| 11 (new) |  | Gomorrah (2008) | £171,348 | £171,348 | £171,348 | new | 1 |
| 12 (9) |  | Fly Me to the Moon 3D (2008) | £150,882 | £197,829 | £509,620 | -52% | 2 |
| 13 (5) |  | Death Race (2008) | £138,731 | £378,434 | £1,920,818 | -69% | 3 |
| 14 (7) |  | Righteous Kill (2008) | £136,145 | £358,646 | £1,939,140 | -68% | 3 |
| 15 (15) |  | Il Y a Longtemps Que Je Taime (2008) | £109,373 | £208,020 | £580,704 | -27% | 3 |
| 16 (13) |  | The Duchess (2008) | £79,936 | £288,550 | £6,649,463 | -66% | 6 |
| 17 (new) |  | Mutant Chronicles (2008) | £74,788 | £74,788 | £74,788 | new | 1 |
| 18 (19) |  | The Dark Knight (2008) | £50,696 | £92,638 | £48,435,525 | -19% | 12 |
| 19 (new) |  | Stone of Destiny (2008) | £48,298 | £48,298 | £48,298 | new | 1 |
| 20 (17) |  | Rocknrolla (2008) | £29,221 | £93,160 | £5,094,165 | -72% | 6 |
| 21 (new) |  | Hello (2008) | £23,201 | £23,201 | £23,201 | new | 1 |
| 22 (20) |  | Wild Child (2008) | £19,431 | £22,528 | £5,107,816 | -61% | 9 |
| 23 (23) | | Unrelated (2008) | £5,116 | £11,531 | £69,416 | -52% | 4 |
| 24 (22) |  | Hellboy II: The Golden Army (2008) | £4,372 | £9,778 | £7,479,962 | -70% | 8 |
| 25 (new) | | Super Agent K9 (2008) | £2,588 | £2,588 | £2,588 | new | 1 |
| 26 (25) |  | Somers Town (2008) | £2,302 | £6,694 | £549,649 | -57% | 8 |
| 27 (new) |  | Bigga Than Ben (2008) | £2,230 | £2,230 | £2,230 | new | 1 |
| 28 (new) | | Tue£day (2008) | £1,605 | £1,605 | £1,605 | new | 1 |
| 29 (27) |  | Man On Wire (2008) | £1,392 | £6,521 | £841,321 | -67% | 11 |