The East Anglia Master Thatchers Association www.eamta.co.uk . Thatchers covering Norfolk, Suffolk, Essex & Hertfordshire.

The National Council of Master Thatchers Associations www.ncmta.co.uk . Ten of the County-based Master Thatchers Associations.

    The National Thatching Straw Growers Association. www.ntsga.org.uk 

  The Thatchers Craft deals with the history of thatching, the stage-by-stage construction using long straw, combed wheat or water reed, and has chapters on materials, tools and roof construction.
The publication is available from this site as facsimiles of the book as 10 PDF documents. You can download these by clicking on the title links.