Vikki Haffenden , coauthor of The Knitting Book (with Frederica Patmore), is a professional knitted textiles designer with a background in commercial knitwear design. She teaches at the University of Brighton, and her work has been featured in Woolcraft , The Cool Girl's Guide to Knitting , and The Cool Girl's Guide to Crochet . Vikki acted as a design consultant to develop Rooster hand-knit yarns and Rooster Pattern Book One . She is the author of Double Bed Machine Knitting: Explained , and her research into knitting was profiled in Selvedge magazine. Frederica Patmore , coauthor of The Knitting Book (with Vikki Haffenden), is a design consultant for Rowan Yarns, one of the biggest providers of luxury yarns in the world. She runs a number of classes at different skill levels in branches of the John Lewis department store and independent knitting shops, and contributes to needlecraft publications. As well as being a master of knitting technique, Frederica is an accomplished and successful knitting pattern designer.