Regarding the fourth season of Torchwood, hasn't there been some speculation that it occurs in a separate timeline to the one that Series 5+ of Doctor Who takes place in? That is, it follows on from TW Series 1-3 and DW Series 1-4, but after that it diverges into a new, distinct continuum? One reason some people seem to be taking this approach seems to be due to the fact that the cataclysmic events of Miracle Day don't appear to have any impact on the "present day" scenes of recent DW stories, particularly those in Series 6.