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Oh, and I forgot to say, at one point I thought the resolution was going to be that Sarah Jane & Jo had never actually seen the Tardis key, it being a new series invention to give one (ooerr) to the companion. I should have guessed we'd get another TLotTL magic mumbo jumbo!
I thought something along those lines, that the resolution would be Jo remembering Pertwee's ankh-shaped key, while Sarah remembered the more traditional yale key - so that the resulting mishmash of the two was no good at all for the Shanseeth.