| Title | Weekend | Week | Total | % Change | Total Weeks | ||
| 1 (new) | ![]() | Avengers: Infinity War () | £29,379,496 | £29,379,496 | £29,379,496 | new | 1 |
| 2 (3) | ![]() | The Guernsey Literary and Potato Peel Pie Society (2018) | £968,681 | £2,208,846 | £3,034,623 | 15% | 2 |
| 3 (2) | ![]() | A Quiet Place () | £920,235 | £1,608,408 | £9,871,073 | -10% | 4 |
| 4 (1) | ![]() | Rampage () | £735,856 | £1,333,133 | £7,816,910 | -48% | 3 |
| 5 (5) | ![]() | Peter Rabbit (2018) | £585,713 | £742,031 | £39,634,873 | 17% | 7 |
| 6 (7) | ![]() | The Greatest Showman (2017) | £300,947 | £527,332 | £45,974,245 | -1% | 18 |
| 7 (6) | ![]() | Truth Or Dare () | £246,426 | £474,244 | £2,193,619 | -39% | 3 |
| 8 (10) | ![]() | Blade Runner (1982) Rerelease | £225,428 | £536,678 | £1,360,442 | -2% | 11 |
| 9 (new) | Cendrillon: Met Opera 2018 (2018) | £212,366 | £212,366 | £212,366 | new | 1 | |
| 10 (4) | ![]() | Ready Player One (2018) | £203,129 | £445,041 | £15,884,060 | -60% | 5 |
| 11 (9) | ![]() | Black Panther (2018) | £185,217 | £346,747 | £50,205,573 | -21% | 11 |
| 12 (new) | ![]() | Beast () | £166,295 | £166,295 | £166,295 | new | 1 |
| 13 (12) | Duck Duck Goose () | £143,716 | £158,345 | £3,530,841 | 20% | 5 | |
| 14 (8) | ![]() | Love, Simon (2018) | £143,540 | £275,060 | £3,540,552 | -48% | 4 |
| 15 (11) | ![]() | Isle of Dogs (2018) | £120,808 | £236,122 | £5,735,046 | -24% | 5 |
| 16 (16) | Funny Cow () | £93,866 | £173,160 | £247,302 | 21% | 2 | |
| 17 (new) | Akram Khan's Giselle: ENB 2017 (2018) | £90,142 | £90,142 | £90,142 | new | 1 | |
| 18 (new) | ![]() | Bing At the Cinema () | £65,535 | £65,535 | £65,535 | new | 1 |
| 19 (24) | ![]() | Early Man () | £30,113 | £30,657 | £11,144,583 | 60% | 14 |
| 20 (15) | ![]() | Ghost Stories () | £28,842 | £85,624 | £1,581,249 | -65% | 4 |
| 21 (new) | The Delinquent Season (2018) | £11,570 | £11,570 | £11,570 | new | 1 | |
| 22 (new) | The Wound () | £8,428 | £8,428 | £8,428 | new | 1 | |
| 23 (22) | ![]() | Finding Your Feet (2018) | £7,414 | £49,749 | £5,660,651 | -43% | 10 |
| 24 (34) | ![]() | Macbeth: RSC Live 2018 (2018) | £6,626 | £13,490 | £633,942 | 58% | 3 |
| 25 (29) | ![]() | You Were Never Really Here () | £4,963 | £11,271 | £1,013,586 | -16% | 8 |
| 26 (new) | Bhai Taru Singh () | £4,792 | £4,792 | £4,792 | new | 1 | |
| 27 (21) | ![]() | Tomb Raider (2018) | £4,050 | £11,561 | £7,731,422 | -73% | 7 |
| 28 (35) | ![]() | Phantom Thread () | £3,756 | £34,596 | £2,743,313 | 46% | 13 |
| 29 (23) | ![]() | Three Billboards Outside Ebbing, Missouri () | £3,391 | £32,772 | £15,154,201 | -73% | 16 |
| 30 (new) | Trener (2018) | £3,358 | £3,358 | £3,358 | new | 1 | |
| 31 (43) | ![]() | Journeyman () | £3,161 | £3,982 | £118,081 | 70% | 5 |
| 32 (new) | Another News Story (2018) | £3,069 | £3,069 | £3,069 | new | 1 | |
| 33 (31) | ![]() | Red Sparrow (2018) | £2,395 | £7,080 | £6,390,458 | -49% | 9 |
| 34 (33) | ![]() | Mary Magdalene (2018) | £2,261 | £16,397 | £795,051 | -21% | 7 |
| 35 (41) | Westwood: Punk, Icon, Activist (2018) | £2,223 | £7,894 | £127,231 | 44% | 6 | |
| 36 (26) | ![]() | Pacific Rim Uprising (2018) | £1,863 | £7,066 | £4,411,046 | -83% | 6 |
| 37 (38) | Monster Family (2018) | £1,084 | £3,060 | £356,544 | -27% | 9 | |
| 38 (32) | ![]() | Darkest Hour (2018) | £1,033 | £29,058 | £24,091,391 | -72% | 16 |
| 39 (new) | Mohanlal (2018) | £751 | £751 | £751 | new | 1 | |
| 40 (36) | Walk Like a Panther () | £486 | £2,870 | £204,397 | -75% | 8 | |
| 41 (re) | ![]() | Bjork Biophilia Live 2014 () | £480 | £480 | £57,253 | re | 9 |
| 42 (30) | Julius Caesar: NT Live 2018 () | £470 | £13,705 | £633,853 | -91% | 6 | |
| 43 (re) | ![]() | Lady Windermere's Fan 2018 () | £384 | £384 | £441,780 | re | 3 |
| 44 (45) | Even When I Fall () | £343 | £3,249 | £20,765 | -53% | 2 | |
| 45 (re) | ![]() | Star Wars: The Last Jedi () | £208 | £208 | £82,676,770 | re | 16 |
| 46 (re) | Messiah From Bristol Old Vic 2018 () | £170 | £170 | £96,588 | re | 3 | |
| 47 (new) | The Deminer (2018) | £164 | £164 | £164 | new | 1 | |
| 48 (50) | The Islands and the Whales (2018) | £118 | £191 | £11,384 | -35% | 4 | |
| 49 (46) | ![]() | Paddington 2 (2017) | £116 | £116 | £42,641,312 | -65% | 25 |
| 50 (re) | ![]() | Manifesto Live From Tate Modern () | £90 | £90 | £38,920 | re | 5 |