The top-performing charity in this month’s review of the Charity Finance 250 Index is the International Bible Students Association (IBSA), which virtually doubled its income to £45.5m in the financial year ending 31 August 2018.

The increase at the religious charity, which aims to promote the Christian faith as practised by Jehovah’s Witnesses, results from a 122 per cent increase in voluntary income to £39.5m and a 35 per cent increase in legacy income to £4.7m.