By Vicky Shaw, PA Personal Finance Correspondent & Lawrence Matheson Charities are missing out on millions because donors forget to tick the gift aid box, says the Charities Aid Foundation (CAF). Last year, only about 55% of donors claimed gift aid when they gave money to charity. The gift aid scheme allows registered charities to reclaim income tax on donations made by UK taxpayers, this effectively boosts the amount of the donation. For basic rate taxpayers, their donations could be increased by 25%, so a £10 donation becomes £12.50 for the charity. Higher rate taxpayers may also claim back …