Hallelujah. I might have found a solution to endless hours with the Pen Tool in PS. I've just downloaded Inkscape - a free program that as far as I can see with my limited knowledge of Illustrator, duplicates a lot of the functionality at a fraction of the price. And when I say fraction I mean a very, very small number very close to zero. Zero, in fact.
The only drawback appears to be I can't export from Inkscape to PS7