HOW MANY TIMES HAVE YOU HEARD THESE PHRASES IN YOUR HOUSE?
“Where’s the key for this window handle ... I’m boiling?”
“Oh no, the window handles are stuck shut, why don’t we have any keys?”
“My upvc window is locked I just need a key, do you have one?”
“Well I’ve lots of other window keys but none that fit my handle”
“These upvc windows are useless, I can’t find my keys to open them...!”
...... SOUND FAMILIAR?