If you don't have brushes sealing the gaps in your existing sash windows use something like this for this winter and strip it off in the spring :-
https://www.amazon.co.uk/Duck-10-Window-Insulator-62-Inch-420-Inch/dp/B002GKC2GW
And get some thick or interlined curtains. Not having thick curtains is going to be a very flashy interior decor statement this winter!
@Airhead started
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If you don't have brushes sealing the gaps in your existing sash windows use something like this for this winter and strip it off in the spring :-
https://www.amazon.co.uk/Duck-10-Window-Insulator-62-Inch-420-Inch/dp/B002GKC2GW
And get some thick or interlined curtains. Not having thick curtains is going to be a very flashy interior decor statement this winter!