Thanks. It looks like the data on leedstraffweb isn't usable. It states:
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II You are not permitted to copy, sub-license, distribute, sell or otherwise make available the Licensed Data to third parties in any form; and.
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I'm not local to the area, but noticed, whilst mapping some features from Bing imagery, the roundels on the roads and missing speed limit data that can be useful for some routing. Hence leaving the note for somebody more local to follow up with a survey.