Thanks to all for these suggestions and comments. I will look at the options suggested by Andreas, and follow Glynn's comment to explore why Cairo dropped to rasterization - it's good to know that *that's* why I got raster output, rather than wrapping a raster being all that Cairo does!
To answer Hamish, no, I was exporting each individual layer using d.vect and d.out.file. Your question gives me the idea I should try using v.out.svg for individual layers to help work out why Cairo dropped to raster output and/or to produce individual layers to stitch together later if necessary. Re Vincent's comment that holding vector format to 'the very end', unfortunately what I'm doing isn't for single-use - I'm producing maps that will be used by several end users for uses ranging from conference posters to individual papers, so I can't predict final image sizes in advance (and I'm not going to be the only end-user). Hence my desire to stick to a vector format in the hopes that they'll at least scale cleanly. Although if Vincent is willing to share an example script that uses imagemagik to compose ps layers I'd be delighted to see it. Thanks again to all for sharing your thoughts & expertise. Peter
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