Sign up for the View from Westminster email for expert analysis straight to your inboxGet our free View from Westminster emailBritain’s ageing and sickly population will start adding a further £20bn a year to the welfare bill by 2029, according to analysis that lays bare the financial challenges of the next government.The booming spending is fuelled by guarantees for pensioners, such as both main parties’ commitment to the pensions Triple Lock, and a growing number of people claiming disability or incapacity benefits, research by think tank Resolution Foundation has found. The welfare bill is forecast to increase by £20.8bn in the year 2028-29 financial year, and increase by £60bn in total over the next four years as spending rises. Nearly half of the forecasted increase in welfare spending will be driven by the cost of the State Pension between 2024 and 2029. Researchers expect a real-term rise of £9.5bn annually by 2029. This is due to an 8.2 per cent increase in the number of pensioners and a 3.6 per cent rise in the real value of the State Pension due to the Triple Lock guarantee, which means pensions rise by average earnings, inflation or 2.5 per cent, whichever is highest, each year.Spending on disability and incapacity benefits will also be a large and growing cost for any future government. These benefits account for 47 per cent of the projected boom in welfare spending, due to an expected increase in the number of people who will not be able to work due to disability and ill health. An additional 2.8 million people in the past four years have started claiming health-related benefits More