Source: Ipsos survey held 5-8 July 2024 and weighted to fit regional totals.
 
The figures in the table above were used alongside the overall party vote totals and population estimates to revise Seven Children’s original Figure 7, based on 2019, into its 2024 form. The ONS estimate population of the UK in mid-year 2024 was 69.025 million – so three million more than what we thought the population was in 2019. Of those, 28.809 million people voted.
 
See: Richard Cracknell and Carl Baker (2024) General election 2024 results , Research Briefing, London: House of Commons Library, 18 July, https://researchbriefings.files.parliament.uk/documents/CBP-10009/CBP-10009.pdf
 
Those voting in the 2024 general election were just 59.8% of the 48 million people registered to vote. So, to the nearest million, 40 million people did not vote or were not registered to vote. Of that 40 million, 14 million were children, leaving 26 million adults who did not vote. Of those adults who did not vote, 20 million chose not to vote, and another 6 million were not registered to vote or were not permitted to register to vote. It is not easy to determine who exactly qualifies to vote in the UK because of complex rules about residency.
 
The number was 7 million of people able to but not registered to vote in England and Wales in April 2024, roughly a million extra appeared to have registered before the election took place in July. See: Craig Westwood (2024) Millions of missing voters urged to register before deadline, London: The Electoral Commission, 9 April, https://www.electoralcommission.org.uk/media-centre/millions-missing-voters-urged-register-deadline
 
The final table here shown below is of the population change in the UK by age, for those readers who are interested in what has happened and where we are heading in terms of how many of us there are, and who will be voting at the next General Election.
 
The first column in Table 2 shows how each population group has changed in size compared to five years earlier. Thus, there are 1% fewer children aged 5–9 in the UK in 2024 than the numbers aged 0–4 in 2019. Deaths and net migration are the only possible reasons. The age group that has grown the most are those aged 20–24 in 2024, by 16%; that has to be due to net in-migration. If you follow down the first column of figures in Table 2, you will note that the first fall is for ages 55–59. This is when deaths begin to take their toll. Follow the column down to its end and you will see that 88% of those aged 95–99 in 2019 did not make it to be 100+ in 2024.
 
The second column in Table 2 is the absolute number of people, in thousands, that the percentages in the first column refer to. The third and fourth columns are the ONS estimates and projections for the population of the UK by age in 2019 and 2024. Note that the total population estimate for 2019 is now thought to have been 66.8 million (nearer to 67). The fifth and sixth columns are the change when we just compare the age groups directly. There were 366,000 fewer children aged 0–4 in the UK in 2024 than in 2019, a 9% fall. This is greater than the 8% fall in the numbers aged 5–9 in 2024. Our primary schools are going to struggle to fill places in future, and then our secondary schools. We will be an even older population at the time of the next General Election, despite the continued immigration that the UK benefits from. The final row in Table 2 shows that we grew in total population size by 3% in these five years. Without immigration we would already be a shrinking island. And, already, the 25–29 age group are fewer in number than those who were of those ages in 2019. Our future will depend as much on who comes and who goes, as on how we vote, and whether we ever manage to make voting fair.
 
Table: Population estimates and projections by the Office for National Statistics, United Kingdom (UK), PERSONS, thousands, 2019, 2024, and change by age group
 

 
Source: ONS Principal projections 2024, and 2018-based projections for 2019.