Unfortunately, i don’t think gift aid is possible here. Becky would have needed to get the donors to complete the Gift Aid declaration forms. She really should have set up a Just Giving but that would have made everything too transparent for her liking.i wouldn’t think the insurance company would. But the place where she had her treatment would be able to. And if it was from individual doners then they’d have had 25% more as they could gift aid.
Tax relief when you donate to a charity
Tax relief on donations, Gift Aid, payroll giving, leaving a gift in your will, keeping tax records; find a charity; donating land, property or shares
www.gov.uk