I've mentioned it before, and I don't know if it's still in print, but there is a Marmite cookery book called "My Mate Marmite In The Kitchen" - By Rosemary Moon, published 1992 by Good Books. ISBN 0 946555 24 9 (softback) and 0 946555 25 7 (hardback). It was a charity fundraiser for the NSPCC.
It also says for more information on Marmite Yeast Extract, contact CPC (UK) Ltd, Esher, Surrey KT10 9PN.
I am full of cold at the moment, and one thing that will jig my cotton-woolly mouth is a nice piece of toast and Marmite.