As Charles Spencer's new memoir about his sister, 'Swan Song: Diana, My Sister,' dominates headlines this week, interest in the Earl's wealth is also increasing. Some critics have accused Spencer of profiting from his late sister's story.
However, Spencer is believed to be a multi-millionaire. His net worth is not known to the public, although a 2009 Sunday Times Rich List estimate put his wealth at $149 million (about £111 million).
