Small, about 3mm-5mm, orangey yellow ant, nest a mound of earth in field. (2 nests within 12cm of each other)
No interactions present.
Yes, I think if you have a yellowish ant in an earth mound in a field it must be Lasius flavus. Some fields can have an extraordinarily high density of large nests, which is taken as an indication that the field has been undisturbed for a long time.
Entomologist and biological recorder
Lat/Lng: 50.4, -4.8
OS grid ref: SX0661