Hi my name is Caroline.
We are also unhappy with the energy bills in our new Charles Church home and it is because the integral garage door does not fit and lets in the wind, and also the rain. The downstairs of our townhouse is always very cold. I can't believe the test results they used, unless the garage was excluded.
Charles Church have refused to fix the garage door or deal with the water ingress, and have stated that an integral garage does not have to be dry!