| Title | Weekend | Week | Total | % Change | Total Weeks |
| 1 (new) |  | The Nun (2018) | £4,098,198 | £4,098,198 | £4,098,198 | new | 1 |
| 2 (1) |  | Christopher Robin (2018) | £883,916 | £1,755,474 | £12,369,115 | -25% | 4 |
| 3 (3) |  | BlackKKlansman (2018) | £792,646 | £1,427,049 | £4,532,092 | -14% | 3 |
| 4 (2) |  | Mamma Mia! Here We Go Again (2018) | £726,771 | £1,596,484 | £63,232,313 | -26% | 8 |
| 5 (4) |  | The Meg (2018) | £612,133 | £1,108,711 | £15,075,792 | -31% | 5 |
| 6 (6) |  | Incredibles 2 (2018) | £608,434 | £1,113,730 | £54,392,749 | -20% | 9 |
| 7 (5) |  | Searching (2018) | £435,094 | £901,153 | £1,666,203 | -43% | 2 |
| 8 (9) |  | Hotel Transylvania 3: Summer Vacation (2018) | £427,742 | £731,710 | £18,264,046 | -23% | 7 |
| 9 (8) |  | The Equalizer 2 (2018) | £403,012 | £793,217 | £6,883,886 | -36% | 4 |
| 10 (new) | | Black '47 (2018) | £398,814 | £398,814 | £398,814 | new | 1 |
| 11 (10) |  | Mission:Impossible - Fallout (2018) | £384,586 | £682,628 | £23,738,345 | -26% | 7 |
| 12 (11) |  | Ant-Man and the Wasp (2018) | £355,342 | £640,523 | £17,353,560 | -28% | 6 |
| 13 (new) | | American Animals (2018) | £347,486 | £347,486 | £347,486 | new | 1 |
| 14 (13) |  | The Children Act (2018) | £297,456 | £672,450 | £2,039,004 | -17% | 3 |
| 15 (12) |  | Yardie (2018) | £196,833 | £410,004 | £848,092 | -55% | 2 |