Therefore, its known narrative elements are not a part of the Doctor Who universe as we, on this Wiki, choose to define it. It may have been the basis for a similar story in another medium, however — and that story may indeed be valid.
Miracle on Bannerman Road was a planned 2011 Christmas special of The Sarah Jane Adventures. The story was based on A Christmas Carol by Charles Dickens and would have seen Sarah Jane Smith being shown the past, present, and future of her life by a mysterious traveller. Fourth Doctor actor Tom Baker was briefly considered for this role, preceding his reappearance as the Curator in The Day of the Doctor by three years.
The story would have ended with the Eleventh Doctor dropping off a baby Sky Smith, saying that he could not explain any more. The story was cancelled for various reasons, and the entrance of Sky into the Smith household was covered instead in one of the only stories completed for series 5, Sky. (DWMSE 32)