I think the RHS site has a message board - maybe try there? God at least I was given a list of pests and diseases to research! Your tutor must be a masochist. Another idea just came to me - Kew are really very helpful, if you ring and explain you are a student they might be able to guide you in the right direction. Good luck

If you pm me I will reply with the list we use - its fairly extensive - wont give you the answers but just a starting point