| Title | Weekend | Week | Total | % Change | Total Weeks | ||
| 1 (new) | ![]() | Mamma Mia! Here We Go Again () | £9,735,930 | £9,735,930 | £9,735,930 | new | 1 |
| 2 (1) | ![]() | Incredibles 2 () | £6,803,384 | £12,774,082 | £22,424,082 | -29% | 2 |
| 3 (2) | ![]() | Skyscraper () | £892,723 | £1,983,554 | £3,813,384 | -51% | 2 |
| 4 (3) | ![]() | Jurassic World: Fallen Kingdom () | £618,226 | £1,201,574 | £39,682,147 | -25% | 7 |
| 5 (4) | ![]() | The First Purge (2018) | £506,578 | £1,132,162 | £4,500,108 | -37% | 3 |
| 6 (new) | ![]() | Hotel Artemis () | £357,261 | £357,261 | £357,261 | new | 1 |
| 7 (5) | ![]() | Ocean's 8 () | £270,273 | £734,510 | £10,465,765 | -49% | 5 |
| 8 (new) | ![]() | Spitfire () | £211,464 | £211,464 | £211,464 | new | 1 |
| 9 (new) | ![]() | Thomas & Friends: Big World Big Adventures: The Movie () | £125,081 | £125,081 | £125,081 | new | 1 |
| 10 (new) | Dhadak () | £111,941 | £111,941 | £111,941 | new | 1 | |
| 11 (16) | ![]() | Sherlock Gnomes () | £74,061 | £133,859 | £8,804,499 | 54% | 11 |
| 12 (7) | ![]() | Sicario 2: Soldado () | £53,084 | £176,908 | £2,015,534 | -60% | 4 |
| 13 (9) | ![]() | Hereditary () | £51,824 | £129,986 | £5,498,016 | -44% | 6 |
| 14 (new) | Teefa In Trouble () | £46,513 | £46,513 | £46,513 | new | 1 | |
| 15 (13) | ![]() | First Reformed (2018) | £46,330 | £120,476 | £193,709 | -37% | 2 |
| 16 (12) | Patrick (2018) | £30,226 | £82,357 | £1,047,026 | -59% | 4 | |
| 17 (new) | A Prayer Before Dawn (2018) | £26,296 | £26,296 | £26,296 | new | 1 | |
| 18 (new) | Generation Wealth (2018) | £17,311 | £17,311 | £17,311 | new | 1 | |
| 19 (23) | ![]() | The Happy Prince () | £14,707 | £52,383 | £775,895 | -4% | 6 |
| 20 (15) | ![]() | Whitney (2018) | £14,675 | £74,363 | £397,895 | -67% | 3 |
| 21 (20) | ![]() | Lean On Pete () | £13,756 | £36,318 | £443,197 | -29% | 12 |
| 22 (17) | ![]() | Solo: A Star Wars Story (2018) | £13,576 | £33,399 | £19,404,602 | -47% | 9 |
| 23 (18) | Swimming With Men (2018) | £11,314 | £45,656 | £216,900 | -50% | 3 | |
| 24 (27) | Zoo () | £9,942 | £23,054 | £105,158 | -20% | 4 | |
| 25 (22) | ![]() | Avengers: Infinity War () | £8,670 | £23,210 | £70,779,932 | -44% | 13 |
| 26 (26) | ![]() | Mary Shelley (2018) | £7,744 | £27,411 | £78,790 | -39% | 3 |
| 27 (21) | ![]() | The Bookshop (2018) | £7,616 | £43,288 | £279,226 | -51% | 4 |
| 28 (new) | ![]() | Escape Plan 2 (2018) | £6,737 | £6,737 | £6,737 | new | 1 |
| 29 (new) | Madame (2018) | £4,357 | £4,357 | £4,357 | new | 1 | |
| 30 (32) | ![]() | Peter Rabbit (2018) | £4,354 | £12,918 | £40,999,583 | -34% | 19 |
| 31 (29) | Pin Cushion () | £3,150 | £17,065 | £27,001 | -68% | 2 | |
| 32 (31) | ![]() | The Beatles: Yellow Submarine () 50th Anniversary | £3,146 | £14,443 | £185,125 | -59% | 3 |
| 33 (re) | Romeo and Juliet: RSC Live 2018 (2018) | £2,710 | £2,710 | £264,416 | re | 1 | |
| 34 (41) | ![]() | The Guernsey Literary and Potato Peel Pie Society (2018) | £2,578 | £7,240 | £5,862,450 | 44% | 14 |
| 35 (30) | McQueen () | £1,908 | £20,105 | £599,058 | -77% | 7 | |
| 36 (36) | Edie (2018) | £1,636 | £14,235 | £456,917 | -48% | 9 | |
| 37 (43) | ![]() | Early Man () | £1,482 | £2,485 | £11,204,953 | 23% | 26 |
| 38 (52) | Postcards From the 48% (2018) | £1,453 | £2,414 | £6,830 | 95% | 2 | |
| 39 (40) | ![]() | On Chesil Beach () | £1,092 | £6,514 | £996,412 | -41% | 10 |
| 40 (45) | The More You Ignore Me () | £1,013 | £3,336 | £22,440 | 25% | 3 | |
| 41 (re) | ![]() | Lady Windermere's Fan 2018 () | £850 | £850 | £447,459 | re | 5 |
| 42 (new) | Dhol Ratti (2018) | £739 | £739 | £739 | new | 1 | |
| 43 (39) | Time Trial (2018) | £686 | £4,377 | £61,928 | -72% | 4 | |
| 44 (38) | ![]() | 2001: A Space Odyssey () Rerelease | £595 | £595 | £413,669 | -76% | 38 |
| 45 (42) | Path of Blood () | £533 | £2,616 | £3,915 | -59% | 2 | |
| 46 (51) | ![]() | The Bromley Boys (2018) | £330 | £330 | £15,225 | 76% | 8 |
| 47 (54) | Terminal (2018) | £330 | £466 | £1,901 | 93% | 3 | |
| 48 (re) | An American In Paris: The Musical (2018) | £168 | £168 | £785,162 | re | 9 | |
| 49 (53) | Mckellen Playing the Part Live 2018 () | £153 | £277 | £47,554 | 69% | 8 | |
| 50 (re) | Wind In the Willows: The Musical () | £152 | £152 | £81,340 | re | 8 | |
| 51 (55) | ![]() | Entebbe (2018) | £88 | £1,693 | £313,239 | 80% | 9 |
| 52 (re) | ![]() | The Beatles: Eight Days a Week - The Touring Years () | £40 | £40 | £1,187,170 | re | 15 |