Several people have asked me what I use to produce schematic diagrams for circuits I put on my website and here on the blog. Well I use a package called sPlan which is available from http://www.abacom-online.de/uk/html/splan.html. This is the package that many SPRAT authors use. Mine is an early version but the latest version is available for 39.9 euros.
The Abacom website gives details of distributors in many countries.