| 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 |
| 16 (12) |  | Mission:Impossible - Fallout (2018) | £97,152 | £171,900 | £24,212,870 | -32% | 9 |
| 17 (16) |  | Cold War (2018) | £70,545 | £146,571 | £894,660 | -35% | 4 |
| 18 (new) | | Batti Gul Meter Chalu (2018) | £58,507 | £58,507 | £58,507 | new | 1 |
| 19 (new) | | Faces Places (2018) | £49,529 | £49,529 | £49,529 | new | 1 |
| 20 (17) |  | The Children Act (2018) | £48,218 | £165,318 | £2,576,497 | -49% | 5 |
| 21 (new) | | Qismat (2018) | £48,177 | £48,177 | £48,177 | new | 1 |
| 22 (new) | | Matangi / Maya / M.I.A. (2018) | £43,130 | £43,130 | £43,130 | new | 1 |
| 23 (new) | | Saamy 2 (2018) | £31,507 | £31,507 | £31,507 | new | 1 |
| 24 (new) | | Climax (2018) | £29,816 | £29,816 | £29,816 | new | 1 |
| 25 (18) |  | Yardie (2018) | £29,403 | £64,971 | £1,086,760 | -57% | 4 |
| 26 (23) |  | Sherlock Gnomes (2018) | £12,267 | £43,079 | £9,475,186 | -56% | 20 |
| 27 (new) | | Nureyev (2018) | £6,828 | £6,828 | £6,828 | new | 1 |
| 28 (24) |  | The Festival (2018) | £5,286 | £18,452 | £3,432,641 | -78% | 6 |
| 29 (31) |  | Thomas & Friends: Big World Big Adventures: The Movie (2018) | £4,545 | £4,882 | £497,056 | 45% | 10 |
| 30 (34) | | Hurricane (2018) | £4,427 | £8,590 | £109,398 | 61% | 3 |
| 31 (32) |  | Spitfire (2018) | £4,040 | £8,336 | £270,408 | 54% | 10 |
| 32 (new) | | Theevandi (2018) | £2,763 | £2,763 | £2,763 | new | 1 |
| 33 (new) | | Where Do We Go From Here?? (2018) | £2,746 | £2,746 | £2,746 | new | 1 |
| 34 (re) |  | The Bookshop (2018) | £2,050 | £2,050 | £415,343 | re | 11 |
| 35 (37) |  | The Merry Wives of Windsor: RSC Live 2018 (2018) | £1,701 | £4,814 | £325,098 | 27% | 2 |
| 36 (56) | | A Prayer Before Dawn (2018) | £1,249 | £1,310 | £88,476 | 97% | 10 |
| 37 (33) | | Sgt. Stubby: An Unlikely Hero (2018) | £1,204 | £1,219 | £112,912 | -34% | 7 |
| 38 (new) | | The Captain (2018) | £1,109 | £1,109 | £1,109 | new | 1 |
| 39 (26) | | The Escape (2018) | £1,042 | £8,981 | £160,120 | -82% | 8 |
| 40 (re) | | Julie: NT Live 2018 (2018) | £1,031 | £1,031 | £224,278 | re | 2 |
| 41 (30) | | Swimming With Men (2018) | £851 | £2,254 | £454,397 | -66% | 12 |
| 42 (42) | | Patrick (2018) | £827 | £1,061 | £1,210,104 | 21% | 13 |
| 43 (43) | | Ocean's Our Blue Planet (2018) | £794 | £916 | £1,828 | 40% | 3 |
| 44 (38) | | Under the Wire (2018) | £566 | £3,339 | £15,648 | -53% | 3 |
| 45 (45) |  | Leaning Into the Wind - Andy Goldsworthy (2018) | £564 | £1,931 | £37,341 | 27% | 6 |
| 46 (49) |  | Whitney (2018) | £485 | £1,921 | £457,131 | 37% | 12 |
| 47 (44) | | The More You Ignore Me (2018) | £425 | £2,073 | £65,394 | -3% | 12 |
| 48 (55) |  | Peter Rabbit (2018) | £425 | £425 | £41,074,481 | 84% | 28 |
| 49 (47) | | Pin Cushion (2018) | £413 | £1,473 | £54,490 | 11% | 9 |
| 50 (52) | | The Eyes of Orson Welles (2018) | £385 | £731 | £34,223 | 47% | 6 |
| 51 (40) |  | Apostasy (2018) | £359 | £4,250 | £330,011 | -57% | 9 |
| 52 (28) |  | Jurassic World: Fallen Kingdom (2018) | £251 | £2,133 | £41,587,292 | -95% | 16 |
| 53 (51) |  | The Guernsey Literary and Potato Peel Pie Society (2018) | £114 | £2,894 | £5,933,847 | -54% | 21 |
| 54 (re) |  | The Happy Prince (2018) | £96 | £96 | £858,780 | re | 13 |