first of all try and push the side of your door towards hinges as this sometimes works as doors swell in heat and dont retract back to where they should be,if this dosnt work have a look at side of hinge,there should be a grub screw,unscrew this then on top of the pin that goes through hinge theres another hex slot,turn this on all hinges in direction away from door,if this dosnt help you need your door re-hanging and would advise a double glazing repair engineer to do this as its a tricky job.hope this helps
shaun www.sdwupvcrepair.co.uk, July 2008