I have seen the new uPVC ones. They're an improvement on the old ones, but - in situ - they look like plastic windows. There's no getting away from it. They look especially plastic from the inside, especially if they're in an environment with other period features, where they stick-out like a sore thumb. I know you've got them, so you have to pretend they don't, but they do. They'rew ultra-smooth, no nicks, no build-of of paint, no imperfections in frame or glass, fugly locks, dentist white.. In other words.. Bosh.. Sore thumb. When you look round a lot of Victorian houses with a view to buy, you notice that the ones with more period features, wooden windows included, go for considerably more, because people are prepared to pay the extra: not everyone, granted, but a significant enough number to make said features worth having an maintaining. And with prices upwards of 600k even for the smaller properties seemingly eye-watering maintenance costs can repay you when you sell. Or - as Red Devil said, kick you up the ass if you've cut costs.