UK tax payers can make donations to FOHU via Stewardship which can benefit from gift aid (normal gift aid rules apply- please see www.gov.uk/donating-to-charity/gift-aid for further details.
The preferred method of donating to FOHU is via a Stewardship Giving account. The account is free and is easy to setup and donations can be made by standing order. (See Stewardship Giving website www.give.net for further details.)