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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.
Cupcakes-
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
Thats a large window for the size of room. If the glass isn't Low-U, maybe consider replacing it with a new double glazed unit. That will keep some more heat in.
Being patterned glass it should be easy to tell:-
Patterned pane inside is standard glass.
Patterned pane outermost will (more than likely)have a Low-U coating on the inner clear pane.
Inline mixed flow extractors probably move 3 times the air volume of the one you have in the window. If theres access above the ceiling to install the ducting and fan, vented outside then that could make a big difference. Especially if you were replacing the glass.