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I've got some old contour plots, paper copy only, that I'd like to be able to put into QGIS. I get as far as a successful polygonize into shp and it looks fine, but the scale is wrong. How might I either: 1. tell the raster routine the correct scale or 2. change the scale of a layer to the correct value in QGIS?

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What do you mean by 'wrong scale'? There should be no issues if you were able to georeference raster correctly. –  SS_Rebelious May 5 '13 at 5:18
Polygonize seems to use 1 map unit per pixel no matter what the georeference scale says, it just uses the x,y in the georeference. The tiff imports correctly when imported as a raster into QGIS. –  johnsankey May 5 '13 at 12:10
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