| Title | Weekend | Week | Total | % Change | Total Weeks | ||
| 1 (new) | ![]() | Aquaman (2018) | £5,230,285 | £5,230,285 | £5,230,285 | new | 1 |
| 2 (new) | ![]() | Spider-Man: Into the Spider-Verse (2018) | £2,279,995 | £2,279,995 | £2,279,995 | new | 1 |
| 3 (2) | ![]() | The Grinch (2018) | £1,747,936 | £2,194,863 | £21,686,463 | -13% | 6 |
| 4 (1) | ![]() | Ralph Breaks the Internet: Wreck-It Ralph 2 (2018) | £1,402,006 | £1,919,671 | £9,324,458 | -43% | 3 |
| 5 (new) | ![]() | Mortal Engines (2018) | £1,269,441 | £1,269,441 | £1,269,441 | new | 1 |
| 6 (3) | ![]() | Creed II (2018) | £749,740 | £1,424,091 | £7,414,211 | -56% | 3 |
| 7 (4) | ![]() | Fantastic Beasts: The Crimes of Grindelwald (2018) | £700,808 | £1,269,858 | £30,541,674 | -52% | 5 |
| 8 (5) | ![]() | Bohemian Rhapsody (2018) | £537,344 | £1,159,114 | £45,147,461 | -45% | 8 |
| 9 (new) | ![]() | Free Solo (2018) | £387,402 | £387,402 | £387,402 | new | 1 |
| 10 (new) | La Traviata: Met Opera 2018 (2018) | £274,847 | £274,847 | £274,847 | new | 1 | |
| 11 (6) | ![]() | Nativity Rocks! (2018) | £232,820 | £298,705 | £2,203,772 | -30% | 4 |
| 12 (new) | The Cbeebies Christmas Show: Thumbelina (2018) | £195,580 | £195,580 | £195,580 | new | 1 | |
| 13 (new) | ![]() | It's a Wonderful Life (1946) Rerelease | £114,865 | £114,865 | £114,865 | re | 13 |
| 14 (7) | ![]() | The Old Man and the Gun (2018) | £103,447 | £310,771 | £628,602 | -67% | 2 |
| 15 (11) | ![]() | The Nutcracker and the Four Realms (2018) | £96,760 | £125,346 | £5,426,212 | -31% | 7 |