Time for clues, I think, though the blue sky and sunshine together with the crystal clear water should be enough to get close.
Definitely British Isles but Treshnish Islands are a bit further south.
'They' now think the plague was in fact a strain of Ebola. Black rats at the time lived only in the cities but the plague spread just as fast in rural areas, in fact at a similar speed to human travel infering people to people infection.......