Are you in Liverpool mate ?
If so I can give you the details of a bespoke company, that do new conservation approved sash windows ( they do all kinds of other stuff - doors / staircases etc )
They’ve done the windows of virtually every house in our road at one time or another - inc ours.
Last time I used them, cost a grand for a gig sash double glazed kitchen window and a small double glazed downstairs bog window.
They only make them and don’t fit them.
As I found out, most window fitters won’t touch wood, as they don’t know how to fit it now, as it’s all upvc and aluminium ( wood expands and contracts )