The Natural Philosopher wrote:
Kate wrote:

Putting 'sammy snakes' (draught excluders) along the bottom of the
curtains stopped the problem completely. Although cutting off the flow
of air made the glass colder, the very limited airflow meant that
condensed vapour could not be replaced, and the problem has gone away.
The dining area is also a lot warmer!

Great advice.

Yes, never thought I'd be reading here 'how to stop condensation with a
snake'

NT