| Title | Weekend | Week | Total | % Change | Total Weeks |
| 1 (1) |  | The Lord of the Rings: The Return of the King (2003) | £6,496,723 | £13,851,918 | £41,841,702 | -9% | 3 |
| 2 (2) |  | Peter Pan (2003) | £1,646,951 | £3,507,338 | £4,866,710 | 17% | 2 |
| 3 (3) |  | LoveActually (2003) | £1,123,685 | £2,282,891 | £31,948,206 | 13% | 7 |
| 4 (new) |  | Stuck On You (2003) | £1,114,837 | £1,114,837 | £1,114,837 | new | 1 |
| 5 (6) |  | Cold Mountain (2003) | £929,366 | £1,398,138 | £1,779,132 | 59% | 2 |
| 6 (4) |  | Freaky Friday (2003) | £853,838 | £1,848,666 | £4,530,548 | 16% | 3 |
| 7 (5) |  | Elf (2003) | £578,001 | £1,464,775 | £15,834,316 | 6% | 6 |
| 8 (8) |  | Brother Bear (2003) | £452,813 | £1,015,622 | £4,445,123 | 42% | 5 |
| 9 (7) |  | Out of Time (2003) | £343,473 | £676,588 | £988,096 | 9% | 2 |
| 10 (9) |  | S.W.A.T. (2003) | £159,022 | £569,314 | £5,149,101 | -28% | 5 |
| 11 (new) |  | American Splendor (2003) | £135,568 | £135,568 | £135,568 | new | 1 |
| 12 (10) |  | Master and Commander: The Far Side of the World (2003) | £117,946 | £311,889 | £6,495,832 | -26% | 7 |
| 13 (13) | | Touching the Void (2003) | £116,260 | £207,025 | £619,011 | 46% | 4 |
| 14 (11) |  | Good Boy! (2003) | £103,448 | £248,632 | £604,963 | 27% | 3 |
| 15 (12) |  | Kal Ho Naa Ho (2003) | £59,630 | £123,717 | £1,549,839 | -21% | 6 |