The whole of this lovely Arts and Crafts home is secondary double glazed, a lot of the original leaded panes are cracked and bowed.

I need to make a decision urgently as Winter is on it's way and there will be a lead time for ordering.

I want to retain the character but install latest specification windows, I don't like the diamond pattern but would be happy to go with square leaded again.

Typically how much should it cost to double glaze a whole house? I don't want white UPVC it would ruin the house.