For me, once licencing issues have been fully resolved, it comes down to accuracy of data.
For example the TfL cycle data is great as it has been collected by ground survey and with two photos of everything. Some other third party data has been less accurate. At this point it becomes tricky as we've no agreed threshold. We all know that OSM is not perfect but less clear on what level of accuracy we require for imports. As for tools, consider Ilya's OSM Conflator tool. Works well for node data. Rob
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