I wonder if the Bank of England knew what they were letting themselves in for when they agreed to put Jane Austen on the £10 note. Janeites have been arguing over the authenticity of portraits for decades. The most settled on is the watercolour sketch held by the National Portrait Gallery and attributed to Austen’s sister, Cassandra. It was offered to James Edward Austen-Leigh (their nephew) by one of their great-nieces for inclusion in his 1869 Memoir.