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Having had a Corsa C with the same problem, the wet drivers floor is nearly always the bulkhead seal on the panel that holds the brake master cylinder. Passenger side is normally blocked scuttle drain holes on passenger side which then overflows down the pollen filter box.
It's a pain in the proverbial to do as you have to take out the window scuttle cosmetics, wiper assembly, brake master cylinder before you can even think about removing the panel to clear off old sealant. And then refitting is reverse of removal.
It helps if you are flexible as you will have to get in under the steering wheel to disconnect the bake pedal.
It's a really bad design as it puts the lower edge of the panel at a low point in the wiper assembly / scuttle area where all rainwater goes. It helps to keep the scuttle drain holes clear but once its gone leaky, renewing the sealant is the only sure fix.
As you are selling, renew the sealant goo and you should be good. We renewed goo and sold ours as we needed an auto. If you were keeping longer term I seem to remember there is a better silicone seal available nowadays as it is such a common issue on a Corsa C.
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