Peter Ashby wrote in
news

With ants you need to be scrupulous about cleanliness so they don't
have a food supply, sugar especially should be in airtight containers,
jam in the fridge. Then you get some proprietary ant killer and put
lots of it about as directed. They will travel a long way for food, if
the only stuff available to them is your poison then they will take
that.

These buggers appear to live inside my walls, in a corner as far away from
food as it's possible to get.

But every year they chew up a bit more woodwork.

Kill, kill

mike