James, congratulations, this sounds like a great opportunity. Whilst it seems like a big step up to you, don't forget, the company believe in your ability to do the job enough to actually make you an offer, so don't sell yourself short!
There are obviously lots of useful resources on the CIMA site, but a couple of others that it may be worth checking out are the websites for both the Chartered Institute of Purchasing and Supply (www.cips.org) and the Chartered Management Insitute (www.managers.org.uk) these both have very good resource sections with articles that might be of use to you.
Good luck with the new role.
