have been encountering the odd ant in the kitchen over the last two weeks but couldn't work out where they came from. then this morning noticed a pile of dust in the corner (against an outside wall) with ants in it. on further inspection they seem to have burrowed through from outside into the corner of the kitchen - yikes! is this serious? anyone know how to deal with this. i have always lived in flats before and ants can't seem to get 3 storeys up so this is a totally new one on me.