I've got UPVC windows at least 25 years old, and I am now unable to open the small (opening outward) windows on the top, when the handle is in the open position, the window still acts locked. When they did work they used to fall fully open when opened slightly, or when the wind got up.

My question is do I repair or will the combination of age and cost to repair mean I will be better off completely replacing?

The window is 2235 x 1250 and I'm guessing at around 6 - £700 to replace and have fitted.

I'm avoiding contacting shops suppliers etc, as you know they will just want my details to 'send someone around to take a look'

Can someone advise on my quandary ?