Yes, and it is in the same position in the later version of stowage in that compartment, with the BREN butt box welded to the floor to the left and slightly further toward the rear of the carrier.
The position appears to correspond with the floor fitting in the two images (yours and Euan's), so I would anticipate that it is the resting point for the Vickers tripod head. I'm guessing that it possibly had a thick felt pad inside the circular fitting on which to rest the Vickers tripod head, otherwise the head would be hammering/vibrating against the steel floor as the carrier moved along.
Mike C
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