The number of people in the public sector’s largest pension schemes retiring on incomes of more than £100,000 has more than tripled in the past seven years, according to figures obtained by a charity promoting intergenerational fairness. Pensions schemes covering the NHS, the civil service and the teaching profession were paying six-figure incomes last year to 375 retirees, up from 117 in 2010. Those in receipt of pensions higher than the UK’s average annual salary of about £28,600 also increased…