To get a printout of the diagram, right click it to download the graphics file, then use a graphics program to print it.

The solution can be found further down the page.

I had seven correct answers. They were from John Stafford, David Groom, Gordon West, Peter Greenhalgh, Michael Hodge (who won the draw), Brett Clark and Jerry Tepper. That was a good entry and shows the popularity of this kind of puzzle. Thanks for all your answers.