India Knight appeals on behalf of Children's Heart Federation. Donations: Freepost BBC Radio 4 Appeal. Credit cards: Freephone 0800 404 8144. Please mark the back of your envelope: Children's Heart Federation. If you are a UK tax payer, please provide The Children's Heart Federation with your full name and address so that they can claim the Gift Aid on your donation worth another 25 per cent. The online and phone donation facilities are not currently available to listeners without a UK postcode. Registered Charity No: 1120557.