Gift aid is tax relief on money donated to UK charities - HMRC
Gift Aid donations made from 6 April 2008 until 5 April 2011, for every £1 donated, the charity can receive 25 pence, so the total value of the donation is £1.25.

Donors must
* pay enough UK income tax and/or capital gains tax themselves to cover the amount of tax the charity will reclaim
* give the charity a gift aid declaration, which should include
- your name
- your home address
- the charity’s name
- details of the donation – saying that it is a gift aid donation
- confirmation that you have paid UK tax – to cover the tax the charity will reclaim.