| Title | Weekend | Week | Total | % Change | Total Weeks |
| 1 (new) |  | The House With a Clock In Its Walls (2018) | £3,370,591 | £3,370,591 | £3,370,591 | new | 1 |
| 2 (new) |  | A Simple Favour (2018) | £1,621,900 | £1,621,900 | £1,621,900 | new | 1 |
| 3 (4) |  | King of Thieves (2018) | £1,535,876 | £2,201,500 | £3,737,376 | 0% | 2 |
| 4 (3) |  | Crazy Rich Asians (2018) | £1,142,208 | £1,975,711 | £3,575,569 | -29% | 2 |
| 5 (2) |  | The Nun (2018) | £1,021,628 | £1,834,027 | £9,497,601 | -44% | 3 |
| 6 (new) |  | Mile 22 (2018) | £795,888 | £795,888 | £795,888 | new | 1 |
| 7 (1) |  | The Predator (2018) | £677,078 | £1,492,409 | £3,886,572 | -72% | 2 |
| 8 (5) |  | Christopher Robin (2018) | £486,411 | £658,776 | £13,837,384 | -7% | 6 |
| 9 (8) |  | Incredibles 2 (2018) | £348,660 | £403,771 | £55,254,076 | 1% | 11 |
| 10 (6) |  | Mamma Mia! Here We Go Again (2018) | £326,986 | £654,919 | £64,872,422 | -33% | 10 |
| 11 (new) |  | The Little Stranger (2018) | £300,089 | £300,089 | £300,089 | new | 1 |
| 12 (9) |  | Hotel Transylvania 3: Summer Vacation (2018) | £256,960 | £333,704 | £18,893,471 | 0% | 9 |
| 13 (7) |  | BlackKKlansman (2018) | £241,540 | £494,083 | £5,908,387 | -43% | 5 |
| 14 (11) | | Black '47 (2018) | £159,028 | £299,508 | £1,102,300 | -25% | 3 |
| 15 (new) | | The Intent 2: The Come Up (2018) | £149,391 | £149,391 | £149,391 | new | 1 |