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unfortunately wedging the letter box open didn't make much difference. Will need to go down the root of putting a vent through a wall. I've got access to a large core-drill bit so hopefully that will do the trick

Great, will give that a go.

The letter box is insulated and has opening flap on the outside. No heating inside

Hi, We have just had a new porch fitted measuring 3m x 1.5m. The problem is that opening closing the interior door is really difficult. As soon as you open the exterior door the interior door is fine. The same is true when opening the exterior door. When the interior door is open the exterior...