The van has a small light over the kitchen bench area and every now and then, the globe cover needed to be removed to clean out what I initially thought were dead insects. On closer inspection, it turns out ants have made a nest in the panel above the bench. Removed the light fitting and sprayed with an ant spray. Stirred them up and made them groggy but didn't seem to kill them off. Will go looking for a stronger anticide tomorrow. Couple of photos of the panel (light removed) showing where they have been nesting. Third photo is of the ants collected before I taped up the hole for the night.