Our population is increasing because people are living longer. Our birth rate is very low and our population would plummet without migration in ten years time. Our death rate is increasing as the baby boomers get older. We need enough people to financially support all the extra pensioners who are too old to work.
The problem our country has is that far too many people want to live near London. The U.K. has space, but not in the south east. We need to encourage more people to move to less densely populated parts of Wales, Scotland, north west, north east England. We need to encourage more employment in these areas.