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There was an interim SouthCentral brand used between Govia taking over from Connex and the launch of the 'New Southern Railway' brand https://trid.trb.org/view/705929
The Managing Director of Southern gives the reasons for the rebranding. People's awareness of SouthCentral as a brand was very low.
Thank you, the one from Wikia is what I was looking for. I was expecting something like the Southern logo with 'SOUTH CENTRAL' in the rectangle but as a temporary brand, the logo seems to fit well.