The Trust has benefited tremendously from money left to it in wills by generous members and supporters. It's not only the rich and famous who leave money to charity, as legacies of all sizes are the foundation for many UK good causes. If you have already made a will and would like to add the Trust as a beneficiary, a simple codicil (amendment) can be added - the Trust has a form you can use, (sample here). If you need a solicitor to help with this you can find one through lawsociety.org.uk. There is free advice for making a will at moneysavingexpert.com - search for "wills".
Advice and guidance on legacies for charities is available at rememberacharity.org.uk. Registered in England No. 1094232. Registered Charity No. CC265331