Dom Thanks for the reply - I now know where to look. Will give it a go when I have a rainy day :-)
Dominic Hargreaves wrote:
As far as adding annotations, depending on what sort of thing you want to add it may be easiest to do so by hand with a vector graphics package (in the SVG file you get from osmarender).
What I had in mind is editing the SVG file using (say) Inkscape. If my extras were placed in a different layer then I could replace the map part should I need to.