The original UTS pneumatic gates from the 1980s (which are all the gates in use at Victoria apart from the Wags and the one next to the Wag at the bottom of the stairs) can only go in the direction which they have been installed in unless they have 2 sets of paddles in which case they can operate either way. I don't know which ones are installed there, but I'll go there tomorrow especially to have a look!Surely it would make sense to reverse the D&C gate arrangements ( all gates are reversible aren't they? ) so that the flow in all parts of the station is consistent?
I suspect the reason it cannot be reversed is because at the moment the space on exiting is much larger (two sets of stairs leading up to a wide area in the ticket hall on the ''paid'' side of the gates. The entrance only has 1 set of narrow stairs on each platform leading up to a narrow footbridge.
In any case, it would not work with the new arrangement as from tomorrow for the next year being implemented due to the escalator replacement works. Passengers in the evening peak will enter the station via the District & Circle gates, go down through the relief subway behind the Eastbound platform and end up at the interchange concourse, using the down escalators there.
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Edit: just been to Victoria, the P-gates there are not of the reversible type and can only operate in one way (the way they've been installed).