It sounds like your door handle set has broken. The lock should be alright since you say it still locks from the inside. I work for a company called "safe n sound ltd" and we supply replacement hardware for pvcu windows and doors to enable them to keep working. We sell products nationwide and have a website where you can identify and buy a replacement pair of handles. The website is "www.safensoundltd.com".
Chris White
April 2005
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