The Association of Illustrators is running a business course for illustrators at the moment at The Rectory, St James Church in London. This is what they say about it:
This intensive course has been put together to help any illustrator acquire the critical skills and knowledge knowledge and critical skills crucial to building a successful career. Structured to be both comprehensive and manageable, each session is tailored to provide an essential step-by-step guide to successful self-employment. It is also an exciting opportunity to meet with peers and get indispensable practical advice and support from industry experts. So stay ahead of the competition, increase your confidence and develop your strategy for the future.
You can find out more or sign up here.