The more ventilation, the less condensation. Especially in plastic tents during winter/dampness. Peg the side against the wind fully to the ground, but not all the way so that you stop the airflow.

Used it for the first time this day, and stayed bone dry, 10c, damp air.

Since it has no side vents I wonder how it will perform in winter.

As Ronald Turnbull says: "Shiver or drip"

Hmmm.. The beak is too small on the outside vents without beeing able to shut them from the inside.

Patching velcro on the vent mesh and a piece of sil nylon seems a solution without piercing the outher fabric.

Hows your seams holding up in wet weather?