UK Box Office 2nd January, 1981
| Title | Weekend | Week | Total | % Change | Total Weeks | ||
| 1 (1) |  | Flash Gordon (1980) | £998,018 | £1,297,423 | £4,654,232 | 0% | 4 |
| 2 (2) |  | The Blue Lagoon (1980) | £213,131 | £309,040 | £1,321,321 | -48% | 3 |
| Title | Weekend | Week | Total | % Change | Total Weeks | ||
| 1 (1) | | Flash Gordon (1980) | £998,018 | £1,297,423 | £4,654,232 | 0% | 4 |
| 2 (2) | | The Blue Lagoon (1980) | £213,131 | £309,040 | £1,321,321 | -48% | 3 |