Well, we may reasonably assume that the mansion's slight lunasynchronous lateral time offset isn't the issue all by itself. That's a relatively minor phenomenon by Time Lord standards, and a TARDIS ought to be able to enter it without too much trouble. As such, either something else is up, and/or the TARDIS is bullshitting the Doctor to get him to stop screwing around and leave the area before he sets something on fire. :)

--G.
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