From my mis-spent youth some 50+ years ago, the Hotel at Freiston Shore stood on the top of the flood bank, and was then known as "The Plummers Arms" I think, could have been a different spelling. A very desolate area, and closer to the shore than HMP North Sea Camp, then a Borstal institution. The borstal had a team in the local cricket league, they played all their matches at hom funnily enough! When a visting team arrived we were locked 3 to a cell in 4 cells while we changed, and after the game the process was reversed. So I, and every other member of visting cricket teams was locked in a cell twice a season, in my case 10 times in total. Possibly the same cell inhabited by the infamous Geoffrey Archer some years later. To return to your query after the digression, I would suggest contacting The Lincolnshire Standard Boston to see if they have any pictures of the hotel in their gallery which they would sell copies.