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Glazing was replaced about a year ago, when the fan was installed (replacing the previous which was around 25 year old glazing plus non-powered vent). The outer pane is patterned glass
It sounds like you probably covered the new low-u glass and a ducted fan is a non starter.
Electric underfloor heating mat?
Dimplex tubular heaters come in 1, 2, 3 and 4ft sizes and can be stacked?
https://www.dimplex.co.uk/product/ecot-3ft-tubular-heater-thermostat
user69121
If only there was a way to get a fan anywhere but in the window... Unfortunately the window goes all the way up to the lintel. And the ceiling is lath and plaster directly onto joists, so no scope there. (If I run a vent between the joists I'll be arguably within the upstairs neighbour's property)
Glazing was replaced about a year ago, when the fan was installed (replacing the previous which was around 25 year old glazing plus non-powered vent). The outer pane is patterned glass.