| Title | Weekend | Week | Total | % Change | Total Weeks |
| 1 (new) |  | Iron Man (2008) | £5,465,103 | £5,465,103 | £5,465,103 | new | 1 |
| 2 (1) |  | Forgetting Sarah Marshall (2008) | £1,328,895 | £2,236,084 | £4,380,122 | -38% | 2 |
| 3 (new) |  | Nims Island (2008) | £820,218 | £820,218 | £820,218 | new | 1 |
| 4 (new) |  | Made of Honor (2008) | £749,611 | £749,611 | £749,611 | new | 1 |
| 5 (2) |  | The Eye (2008) | £366,298 | £667,635 | £1,372,290 | -48% | 2 |
| 6 (3) |  | 21 (2008) | £319,318 | £537,417 | £5,024,103 | -42% | 4 |
| 7 (5) |  | In Bruges (2008) | £296,972 | £511,018 | £4,065,217 | -27% | 8 |
| 8 (4) |  | Fools Gold (2008) | £189,221 | £396,199 | £2,241,576 | -60% | 3 |
| 9 (10) |  | Happy-Go-Lucky (2008) | £178,390 | £274,334 | £1,085,089 | -25% | 3 |
| 10 (14) |  | Persepolis (2008) | £126,409 | £220,167 | £379,034 | -20% | 2 |
| 11 (6) |  | Son of Rambow (2008) | £105,303 | £186,817 | £4,051,586 | -62% | 5 |
| 12 (9) |  | The Spiderwick Chronicles (2008) | £98,546 | £135,305 | £10,396,018 | -59% | 7 |
| 13 (11) |  | Step Up 2: The Streets (2008) | £98,452 | £171,406 | £10,371,359 | -59% | 7 |
| 14 (7) |  | Deception (2008) | £82,609 | £217,017 | £472,975 | -68% | 2 |
| 15 (new) |  | Kuruvi (2008) | £77,328 | £77,328 | £77,328 | new | 1 |