How curious! The AWM registration numbers lists the hull number for a Metrpolitan Gasworks Carrier with the ARN 29865 as "284A".
I have not found any other records for hulls with a A suffix, and here you are with 283A!! All the other details you mention (the flat gunners plate for Vickers gun, tool stowed on the side, etc) point to this being an early LP2.
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