| Title | Weekend | Week | Total | % Change | Total Weeks | ||
| 1 (new) | ![]() | The Nun () | £4,098,198 | £4,098,198 | £4,098,198 | new | 1 |
| 2 (1) | ![]() | Christopher Robin () | £883,916 | £1,755,474 | £12,369,115 | -25% | 4 |
| 3 (3) | ![]() | BlackKKlansman () | £792,646 | £1,427,049 | £4,532,092 | -14% | 3 |
| 4 (2) | ![]() | Mamma Mia! Here We Go Again () | £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 () | £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 () | £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 () | £398,814 | £398,814 | £398,814 | new | 1 | |
| 11 (10) | ![]() | Mission:Impossible - Fallout () | £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 () | £297,456 | £672,450 | £2,039,004 | -17% | 3 |
| 15 (12) | ![]() | Yardie (2018) | £196,833 | £410,004 | £848,092 | -55% | 2 |
| 16 (15) | ![]() | Cold War () | £150,559 | £303,864 | £532,644 | -34% | 2 |
| 17 (new) | The Miseducation of Cameron Post (2018) | £142,996 | £142,996 | £142,996 | new | 1 | |
| 18 (16) | ![]() | The Festival () | £108,980 | £230,904 | £3,337,567 | -45% | 4 |
| 19 (new) | Hurricane () | £62,459 | £62,459 | £62,459 | new | 1 | |
| 20 (new) | ![]() | The Seagull () | £44,441 | £44,441 | £44,441 | new | 1 |
| 21 (new) | The Hows of Us (2018) | £23,884 | £23,884 | £23,884 | new | 1 | |
| 22 (new) | Puzzle (2018) | £23,565 | £23,565 | £23,565 | new | 1 | |
| 23 (new) | Imaikkaa Nodigal (2018) | £13,183 | £13,183 | £13,183 | new | 1 | |
| 24 (new) | ![]() | Final Score () | £9,945 | £9,945 | £9,945 | new | 1 |
| 25 (22) | ![]() | Jurassic World: Fallen Kingdom () | £9,170 | £24,470 | £41,573,492 | -63% | 14 |
| 26 (new) | Paltan () | £8,300 | £8,300 | £8,300 | new | 1 | |
| 27 (new) | Under the Wire () | £7,789 | £7,789 | £7,789 | new | 1 | |
| 28 (28) | ![]() | Thomas & Friends: Big World Big Adventures: The Movie () | £4,714 | £6,893 | £488,963 | 13% | 8 |
| 29 (27) | ![]() | Sherlock Gnomes () | £3,536 | £6,858 | £9,404,181 | -50% | 18 |
| 30 (30) | Sgt. Stubby: An Unlikely Hero () | £2,967 | £3,189 | £109,728 | -16% | 5 | |
| 31 (40) | The Escape (2018) | £2,662 | £4,756 | £139,250 | 54% | 6 | |
| 32 (29) | Swimming With Men (2018) | £2,299 | £28,629 | £430,170 | -41% | 10 | |
| 33 (38) | ![]() | The Bookshop (2018) | £2,195 | £17,938 | £404,796 | 39% | 10 |
| 34 (33) | The More You Ignore Me () | £1,908 | £5,702 | £60,069 | 1% | 10 | |
| 35 (31) | ![]() | Apostasy () | £1,551 | £5,206 | £323,240 | -48% | 7 |
| 36 (44) | ![]() | Everybody's Talking About Jamie () | £1,295 | £6,038 | £715,719 | 16% | 8 |
| 37 (35) | ![]() | Spitfire () | £1,104 | £3,406 | £258,175 | -34% | 8 |
| 38 (46) | Patrick (2018) | £995 | £995 | £1,206,530 | 7% | 11 | |
| 39 (23) | The Ballymurphy Precedent () | £909 | £5,274 | £22,105 | -95% | 2 | |
| 40 (45) | ![]() | The Happy Prince () | £770 | £4,595 | £853,416 | -29% | 12 |
| 41 (re) | Pin Cushion () | £641 | £641 | £52,071 | re | 7 | |
| 42 (52) | ![]() | Peter Rabbit (2018) | £562 | £562 | £41,074,067 | 42% | 26 |
| 43 (re) | ![]() | One Note At a Time (2018) | £499 | £499 | £3,371 | re | 2 |
| 44 (re) | Julie: NT Live 2018 () | £356 | £356 | £218,131 | re | 1 | |
| 45 (new) | Ocean's Our Blue Planet () | £329 | £329 | £329 | new | 1 | |
| 46 (26) | The Man From Mowax () | £279 | £4,561 | £17,667 | -98% | 2 | |
| 47 (43) | The Eyes of Orson Welles () | £201 | £1,265 | £32,794 | -82% | 4 | |
| 48 (37) | ![]() | The Beatles: Yellow Submarine () 50th Anniversary | £167 | £1,911 | £214,992 | -88% | 10 |
| 49 (36) | ![]() | The Guernsey Literary and Potato Peel Pie Society (2018) | £116 | £24,462 | £5,903,238 | -93% | 19 |
| 50 (48) | ![]() | Whitney (2018) | £42 | £716 | £454,095 | -92% | 10 |
| 51 (53) | A Prayer Before Dawn (2018) | £8 | £224 | £87,066 | -89% | 8 | |