Hi Darren,
Got any images showing that? If it was an 'add on', it was done to more than one carrier (see above). It's also about the right size to cradle the round cast bronze head of the tripod. Maybe it was an 'add on' improvement by Defence (rather than being part of the original build)?
The head of the Vickers Tripod sits on the floor, and there is a space behind it due to the shape of the air intake cowl, which is angled. The modern images above don't have the intake cowl fitted.
Mike C
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