About

Check https://www.repairmywindowsanddoors.co.uk/eastcote-windowrepair/ how your window operates. Slide the sashes up and down. Adjust your shims and mounting screws needed until the windows slide freely. Also check the tilt-in feature for proper operation.
https://www.repairmywindowsanddoors.co.uk/hythehampshire-windowrepair/ . You can have the nice window your world, simply by it's installed wrong, it matters not. Make sure https://www.repairmywindowsanddoors.co.uk/sandy-windowrepair/ ask how long the company has been installing windows and