The triple lock will cost households around £10bn extra a year by 2034, prompting warnings that taxpayers will be forced to work longer to pay for the increase. The Office for Budget Responsibility’s (OBR) latest long-term assumptions for the economy suggest that annual spending on the state pension will soar past £150bn in real terms within the next decade. Economists warned that the triple lock – which ensures state pension payments rise in line with the highest of inflation, average wage growth or 2.5pc every year – will place an unsustainable burden on taxpayers. The current full state pension is £221.20 per week after rising by 8.5pc in April. The triple lock will ensure the 4.3 million pensioners who currently receive the full state pension see a real weekly uplift of around £50 a week by 2034, which is around £11.30 per week higher than if the state pension rose in line with average wage growth – as was the case previously. Based on the latest Office for National Statistics (ONS) population projections, this will add up to an extra £10bn a year to the state pensions bill in a decade, relative to it being raised in line with earnings....