Enough of intellectual contortions. For the last few years all of the geomorphologists (including me!) who have been mulling over the significance of the Late Devensian ice limit on the north coast of the Isles of Scilly have been trying to work out how an ISIS terminus (or lateral ice edge) at this position could be squared with an ice edge far to the south, on the continental shelf edge. Most people have shrugged their shoulders and tried to explain that on the eastern flank of the ice stream the ice really did stop here; and some have become so wedded to this idea that they have become really rather angry that I should have had the temerity to say that there was evidence of active ice further south, on the coasts of St Agnes and St Mary's islands.
The map below updates the map published with my QN article (2018) by adding an ice edge along the eastern and south-eastern margins of the archipelago.
It's interesting that some of the models by the BRITICE group and others have also shown the Scilly archipelago as a nunatak, surrounded by streaming ice. Another factor that feeds into the discussion is the "accepted wisdom" that the ISIS terminated at the northern coast of the archipelago, meaning that sea-bed studies of sediments and bedforms have been largely ignored to the south and east of the islands, with effort (quite understandably) concentrated further to the west and south-west, in the centre of the perceived ice stream.
So if evidence is missing, it is because hardly anybody has tried to collect it......
I believe that there is nothing in the literature re sea floor sediments and bedforms to contradict this "nunatak" hypothesis. As ever, comments and additional information are welcome.