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Keep up with the ant power around the outbuilding, and go out, find out where they're coming from, find the ant nests and hit those as well. Need to keep up with it for a few weeks, it'll work eventually.
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We use ant powder and also boiling water in the nest if you find it. Also make wherever they get food from scrupulously clean.
Borax mixed with sugar can also do the trick (sugar to attract, borax to kill though seems to be a banned substance these days)
If possible Get in and destroy the nest hoovering the bastards up. We also use vinegar to destroy the pheromone trails.
They also don't like chilli powder.
Jameo
Grumpy_Git
@Hovis
Does anyone have any experience with ant extermination? Or a recommendation for an exterminator in London? The fuckers are marching up the concrete slab of my garden outbuilding, eaten through the dpc at at least one spot and infested the back wall, eating insulation and laying eggs. I've tried nippon liquid baits along the trail and in the hole but that just slows them down for a day and then normal service resumes. I plan on sealing the cill plate with some kind of heavy duty mastic to deter them in the future, but feel like I need to kill off whatever is inside the walls beforehand or they'll just find another way.