| Title | Weekend | Week | Total | % Change | Total Weeks |
| 1 (1) |  | Christopher Robin (2018) | £1,173,235 | £3,429,276 | £10,613,641 | -45% | 3 |
| 2 (2) |  | Mamma Mia! Here We Go Again (2018) | £976,039 | £2,887,083 | £61,635,829 | -43% | 7 |
| 3 (6) |  | BlackKKlansman (2018) | £922,806 | £1,870,829 | £3,105,043 | -25% | 2 |
| 4 (3) |  | The Meg (2018) | £881,145 | £2,232,551 | £13,967,081 | -41% | 4 |
| 5 (new) |  | Searching (2018) | £765,050 | £765,050 | £765,050 | new | 1 |
| 6 (4) |  | Incredibles 2 (2018) | £762,307 | £2,049,213 | £53,279,019 | -40% | 8 |
| 7 (new) |  | The Happytime Murders (2018) | £694,044 | £694,044 | £694,044 | new | 1 |
| 8 (5) |  | The Equalizer 2 (2018) | £625,218 | £1,531,945 | £6,090,669 | -50% | 3 |
| 9 (9) |  | Hotel Transylvania 3: Summer Vacation (2018) | £555,404 | £1,565,938 | £17,532,336 | -39% | 6 |
| 10 (8) |  | Mission:Impossible - Fallout (2018) | £521,610 | £1,200,384 | £23,055,717 | -44% | 6 |
| 11 (10) |  | Ant-Man and the Wasp (2018) | £492,445 | £1,242,971 | £16,713,037 | -38% | 5 |
| 12 (new) |  | Yardie (2018) | £438,088 | £438,088 | £438,088 | new | 1 |
| 13 (11) |  | The Children Act (2018) | £359,044 | £849,176 | £1,366,554 | -31% | 2 |
| 14 (7) |  | The Spy Who Dumped Me (2018) | £230,993 | £880,459 | £1,937,670 | -78% | 2 |
| 15 (new) |  | Cold War (2018) | £228,780 | £228,780 | £228,780 | new | 1 |