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How can I release the window?

Our bathroom UPVC double glazed window will not open. When you turn the handle the bolts do not move, so the window is still as if it is locked. I can unscrew the window handle and my guess is that the lock has sheared inside the frame, because the window bolts don't retract even when I operate the lock with a screwdriver.

How can I release the window?
Steve, April 2021