I think it is Formica aquilonia
If I remember correctly, Formica aquilonia are very much Northern based, as in mainly Scotland... Where did you collect them, roughly ;)
East Sussex
Looks like they may be rufibarbis (Rufa?), and they are threatened.. Very cool, I will have to get down there with my macro and get some good photos.
They are not likely to be Formica aquilonia then. The only references I can find of nest sites of Formica rufibarbis in mainland UK are Chobham Common, so did you find them there? Or very close by?
Nowhere near there, it was near heathfield. I have found a video on the net about a colony near heathfield but this is a totally different location about 2 miles away.
I live in East Sussex, the only species I have been able to find are Lasius n iger and Lasius flavus :/
Lucky you!
F ormica sanguinea maybe?
It might be a Formica pratensis colony?
Don't know if they life there, but they look like it.
was this in Selwyns wood, cross in hand?
I live very near here.