I've had cavity wall insulation in my previous house, and it was done by drilling lots of holes on the exterior walls and pumping insulation in. That was okay because, after the holes were filled I painted the house.
However, my new house has bright white dashing on it, and I'm sure it would look a mess if holes were drilled all over it. I'm sure even filling the holes with the same type of dashing would look bad. Is there any kind of cavity wall insulation that I can use without drilling loads of holes? A few holes would be acceptable.