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Thanks! Secondary glazing is essentially just an internal casement window, right? The condensation is usually fine, only if it's totally freezing do I get it a tiny bit.

Thanks. I could see lots of gaps and light around the parting bead, as seen here: So I sealed the gaps using Schlegel seals. No more light coming through, so I think it's totally sealed. My solution seems to work, but it's a bit of a "hack". Surely someone must have come up with a design...

what did you do about this in the end? I have the same problem. I can always see a bit of light when I look down at the parting bead where the two sashes meet.