Prince Philip is "continuing to make good progress" following his hospital treatment, a source has said, and is very keen to carry out the engagement in Edinburgh.
The Duke has been an honorary fellow of the Royal Society of Edinburgh since 1951 - one of his oldest patronages - and has presented Royal Medals on several occasions.
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The pristine collection from the 1960s and 1970s could net owner Doug Carpenter a packet if they sell at auction today.