Buckingham Palace is encouraging members of the public wishing to make donations in memory of the Queen Mother to give to Queen Elizabeth's Charitable Trust.
The trust, which was formed in 1996, provides grants for charitable causes with which the Queen Mother had a connection.
They include the 350 organisations of which she was a patron. These range from Barnardo's, the British Red Cross, the Children's Society, the RSPCA, the Guide Association, St John Ambulance, through to Mencap.
Mencap told Third Sector it would be looking for another royal patron to replace the Queen Mother. Others, such as St John Ambulance and Barnardo's, said they would not be talking to other members of the royal family as they also had the Queen as a patron.
Donations to the trust's charities can be made over the counter at all high-street banks, via post, or online through the Queen Mother's memorial web site, which is located at www.royal.gov.uk.