Having spoken to Philip at LGP about working for him he has since sent me information from two of his ink suppliers. I thought this was really kind of him as it is something I hadn't asked from him in particular, and it will help me a great deal when creating the set of concertina booklets for him and his clients. Below is the email from Philip.
I can also take influence from the layout of their pages as well. I am going to read through all of this information thoroughly before applying it to my own work.