The top the the Circle Line curves around sharply at Aldgate to loop back around the bottom section. We realised therefore that there's possible a few places where you could get out from a Circle Line train and walk, and beat it on foot. So we tried Blackfriars to Farringdon, and then Barbican to Mansion House.
We suspect that Moorgate to Monument might be possible too! But we'll leave that one for you to try ...

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