| Title | Weekend | Week | Total | % Change | Total Weeks |
| 1 (new) |  | Mamma Mia! Here We Go Again (2018) | £9,735,930 | £9,735,930 | £9,735,930 | new | 1 |
| 2 (1) |  | Incredibles 2 (2018) | £6,803,384 | £12,774,082 | £22,424,082 | -29% | 2 |
| 3 (2) |  | Skyscraper (2018) | £892,723 | £1,983,554 | £3,813,384 | -51% | 2 |
| 4 (3) |  | Jurassic World: Fallen Kingdom (2018) | £618,226 | £1,201,574 | £39,682,147 | -25% | 7 |
| 5 (4) |  | The First Purge (2018) | £506,578 | £1,132,162 | £4,500,108 | -37% | 3 |
| 6 (new) |  | Hotel Artemis (2018) | £357,261 | £357,261 | £357,261 | new | 1 |
| 7 (5) |  | Ocean's 8 (2018) | £270,273 | £734,510 | £10,465,765 | -49% | 5 |
| 8 (new) |  | Spitfire (2018) | £211,464 | £211,464 | £211,464 | new | 1 |
| 9 (new) |  | Thomas & Friends: Big World Big Adventures: The Movie (2018) | £125,081 | £125,081 | £125,081 | new | 1 |
| 10 (new) | | Dhadak (2018) | £111,941 | £111,941 | £111,941 | new | 1 |
| 11 (16) |  | Sherlock Gnomes (2018) | £74,061 | £133,859 | £8,804,499 | 54% | 11 |
| 12 (7) |  | Sicario 2: Soldado (2018) | £53,084 | £176,908 | £2,015,534 | -60% | 4 |
| 13 (9) |  | Hereditary (2018) | £51,824 | £129,986 | £5,498,016 | -44% | 6 |
| 14 (new) | | Teefa In Trouble (2018) | £46,513 | £46,513 | £46,513 | new | 1 |
| 15 (13) |  | First Reformed (2018) | £46,330 | £120,476 | £193,709 | -37% | 2 |