At long last, I've added a buffer stop to the siding in front of the goods shed.
Rather than use one of the new Association etches, this one is scratchbuilt, based on a Highland Railway example (plate 162 of "Highland Miscellany by Peter Tatlow; drawings by the same author of what appears to be the same stop are in the Highland Railway Journal No.10, 1989). Bullhead rail was bent to shape and soldered to form each side of the structure (8 pieces in all). The 1'x1' timber baulk is laminated from two lengths of PCB point sleeper.