The UK population could rise significantly under the immigration approach associated with the Green Party leadership of Zack Polanski, according to analysis from investment bank Panmure Liberum.
The report suggests that if net migration were to reach around 900,000 a year, the UK population could increase from 71.5 million in 2029 to 75.9 million by 2034.
It contrasts this scenario with alternative policy trajectories, estimating lower population growth under proposals associated with other parties, including much tighter migration levels under Reform UK and more moderate inflows under Conservative policy assumptions.
Under the Reform UK approach, net migration is projected at around 40,000 annually, while the Conservative trajectory is estimated to add roughly 160,000 people per year.
The analysis highlights the scale of divergence between competing political approaches to migration and their long-term demographic implications.
Supporters of higher migration levels often argue that inflows are necessary to offset an ageing population, support labour markets, and sustain public services. Critics, however, warn that rapid population growth can place additional pressure on housing, infrastructure and public services unless matched by investment.
The projections come amid a broader political debate over the UK’s future immigration system, with parties increasingly framing migration not only as an economic issue but also as a question of national capacity and long-term planning.
Analysts caution that such long-range forecasts are highly sensitive to assumptions about economic growth, labour demand and policy enforcement, meaning actual outcomes could vary significantly from headline projections.
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