Judging by {SAS}TB's silence, I think they might have taken over his household.
Not far off ................
We had no more ants after the Nippon applications then on Saturday within the space of minutes 1 turned to 10 turned to probably 200-300 falling onto the worktop - slayed with ant spray and looked outside
the little ******* were coming in through the extract vent
More Nippon, ant powder and spray and sealed the extract duct entry point in the kitchen, fine.
Then, last night, about 100-150 started pouring through the weep vents in the dining room window - cue screaming freaked out wife, more powder, more Nippon and more spray
The lawn out the back was literally crawling with hundreds of the winged ones (which I believe are newly hatched ants about to fly off to find a mate - jesus)
Anyway the local birds had a field day and we have also found another 2 or 3 potential nests - all have been heavily powdered
I also called environmental services at the local council (who got rid of a wasps nest for us a few years ago and did a great job) - Their pest control chap is coming Friday afternoon - hopefully with a large ant cannon.
£60 for as many treatments (i.e. suspected nests) as needed and then 3 month "warranty" where they come back free of charge to address any further infestations. For£60 I thought that was a bargain !
Further updates after the ant slayers visit ......................