According to Ray Howlett's piece "The Enigma that is Trimley" (published in the parish magazine), the Ship was

Converted to two houses many years ago. These are adjacent to Chapel Yard, to the side of what was the old chapel on the High Road near to the Post Office.

Many thanks to Paul Turner who identified the correct building for us as the house he lives in.

It's actually in Trimley St Martin, not St Mary as we had thought.