Exact published cells: worksheet 3, B4:E4 and B141:E141
Total: 32,063,800 - 28,393,100 = 3,670,700
Non-UK: (2,246,800 - 1,839,000) + (4,214,100 - 1,684,800) = 2,937,100
2,937,100 / 3,670,700 * 100 = 80.0147%

Same-month sensitivity check: worksheet 3, B9:E9 and B141:E141
2,837,600 / 3,586,100 * 100 = 79.1277%

Published categories independently rounded to nearest 100; full-period component changes exceed published total change by 100
Data: Crown copyright, Open Government Licence v3.0
https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/