Drawing number?

Going back to the original thread posting.

I have identified three similar sites at Riccall, Yorks. They are perimeter defence structures constructed of circular concrete piping or brick raised above ground surface with a central gun mounting. They have adjacent square brick-lined access hatches.

They don't seem to correspond with Tett of Alan-Williams turret bases but would not have an access hatch if it was an open gun pit?

Any thoughts?

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These gun pits appear to have had motley mounts in them which were entered from below. I suspect with the weapons and mount in place it would have been a tight squeeze to get into the pit from above and then contort yourself into the mount. The below ground access hatch would have made it a bit easier and also provided a place for the loader to shelter.