The Office for National Statistics (ONS) is not scheduled to release their data until 2023, so the current annual release of Maptitude does not contain that data. This data should be available with Maptitude 2023, which is scheduled for release in Quarter 1 of 2023. You can read more about the ONS timeline here: https://www.ons.gov.uk/census/censustransformationprogramme/census2021milestones
Northern Ireland is on the same schedule as England and Wales, so the first results for Census 2021 statistics are scheduled for release on May 24th 2022. Other main Census 2021 statistics will be released in stages up to summer 2023: https://www.nisra.gov.uk/statistics/2021-census/outputs-prospectus/release-plans
The Ireland census data is scheduled for release in June 2022: https://www.citizensinformation.ie/en/government_in_ireland/national_government/copy_of_census.html#:~:text=Form%20(PDF).-,Census%20results,increase%20on%20the%202011%20census.
Scotland is conducting their Census in 2022, so results will only start to be released in 2023: https://www.scotlandscensus.gov.uk/about/planning-the-2022-census/statistical-methodology/2022-outputs/