Long line of ants carrying eggs and larvae from the nest in the hole (location indicated by the bag in the last photo, and shown in the penultimate photo) to at least the grassy indent into the heath on the bottom left of that photo (where I couldn't follow them any more into the heather. No obvious issue with the original nest. Either ants moving their our larvae/ eggs, or possibly raiding another ant species' nest for young??
Any suggestions? These pods are in the gap between a door and it’s frame. East facing, very sheltered.