In the 'modern' picture, those appear to be wooden benches. The 'early' picture appears to show bench cast 'ends' with the GWR logo within the casting. I believe there were two variants but, don't ask........

In fact, these seat end castings are still available [new]. Both types, I believe.
From memory, when Hayles Abbey Halt was re-constructed, they placed in the platform shelter, a 'long' bench seat, on the basis that it would be too heavy for anyone to remove for the scrap value. I think it took six people to carry it down the slope and put in place.
As to the positioning of the bench in the 'early' photo, I believe that 'rules' dictate that obstructions should not be placed within 7 feet of the Platform edge. Clearly that, alongside the footbridge steps, was 'posed'.
Looking at the persons in the photo, back row, left, he certainly seems to have the demeanour of the 'Railway Detective' and, the person next to him, his hapless colleague.
Seated, far right. He'd just 'passed wind'.
