| Title | Weekend | Week | Total | % Change | Total Weeks |
| 1 (new) |  | Tropic Thunder (2008) | £2,483,568 | £2,483,568 | £2,483,568 | new | 1 |
| 2 (2) |  | Mamma Mia! (2008) | £708,489 | £1,512,702 | £61,653,876 | -33% | 11 |
| 3 (4) |  | The Women (2008) | £605,390 | £1,328,812 | £2,194,122 | -30% | 2 |
| 4 (1) |  | Pineapple Express (2008) | £547,701 | £1,191,915 | £2,564,826 | -60% | 2 |
| 5 (5) |  | The Duchess (2008) | £518,865 | £1,312,613 | £4,767,223 | -39% | 3 |
| 6 (8) |  | The Boy In the Striped Pajamas (2008) | £451,446 | £822,291 | £1,335,944 | -12% | 2 |
| 7 (3) |  | Rocknrolla (2008) | £439,848 | £909,617 | £4,275,696 | -52% | 3 |
| 8 (7) |  | Disaster Movie (2008) | £371,142 | £494,263 | £2,262,969 | -37% | 3 |
| 9 (6) |  | Step Brother's (2008) | £311,957 | £600,460 | £5,846,131 | -50% | 4 |
| 10 (9) |  | The Strangers (2008) | £216,437 | £391,658 | £4,025,916 | -47% | 4 |
| 11 (10) |  | The Dark Knight (2008) | £211,370 | £379,285 | £48,020,515 | -40% | 9 |
| 12 (11) |  | Hellboy II: The Golden Army (2008) | £104,068 | £180,079 | £7,379,488 | -53% | 5 |
| 13 (13) |  | WALL•E (2008) | £91,380 | £110,995 | £22,340,631 | -42% | 10 |
| 14 (15) |  | Wild Child (2008) | £82,665 | £95,467 | £4,971,063 | -38% | 6 |
| 15 (12) |  | Eden Lake (2008) | £78,729 | £212,731 | £404,758 | -59% | 2 |