Hopefully someone out there has experience of this.
My wife wants some roller blinds or curtains (she's not made her mind up yet) hung up over the windows in our conservatory. But it's all UPVC frame and I'm not sure how to hang stuff up in there. She reckons it's possible to just put screws into the frame but I'm not convinced. I'm fairly certainly it'll invalidate any warranty at best or break something at worst.
Any ideas? Ta.