In order to claim Gift Aid, the supporter must be a registered UK tax payer and pay enough income tax and/or capital gains to cover the amount reclaimed by all charities and CASCs they donate to in each tax year.
The supporter must be donating their own money (not money collected offline or on behalf of someone else ) and must confirm that the donation will not directly benefit the donor or their family, for example, some membership fees or for a ticket to an event the charity is holding.
For more information on Gift Aid, visit the HMRC website.