Large Rose Sawfly Arge pagana

Large Rose Sawfly Arge pagana, North Elmham Cathedral Meadows (Norfolk, UK), 31st July 2021

I had originally put these larvae down as Arge pagana, and that may be the case, but I'm told that Arge ochropus probably isn't safely ruled out from these photos.

Large Rose Sawfly Arge pagana or Arge ochropus larvae, North Elmham (Norfolk, UK), 22nd July 2017