Thanks @robinbanks! Here are some photos, sorry it's about the best I can do - the excluder seems to be completely integrated, but as you can see it's not effective anymore
Hello,
Our front door seems to have a built-in draught excluded which has failed and no longer prevents draughts (light can be seen between the door and the frame) - however we have no idea who made the door, and the previous owners didn't provide us with any details nor a Fensa certificate...