it seems that everytime you lift the handle up and the plate the hook gets caught it seems that the hook is oversized to come out of the hole ,now I know one of you clever lot will hopefully tell me were Iam going wrong
cheers keith

I second that - I think this can also make the door handle appear floppy, as the latch is held partly open. (from memory - so I may be wrong)Some times when you think the door is shut, the latch still might not be fully enagaged. With a bit of wear, this can easily make the latch pop onto the secondary catch.