Donations to RETRAK should be sent to FREEPOST BBC Radio 4 Appeal, please mark the back of your envelope RETRAK. Credit cards: Freephone 0800 404 8144. If you are a UK tax payer, please provide RETRAK with your full name and address so they can claim the Gift Aid on your donation. The online and phone donation facilities are not currently available to listeners without a UK postcode. Registered Charity Number: 1122799.