Lyn,
Had a similar problem yesterday, except my handle wouldn't move down. Thought about it at work, and found your question on the web at lunch time. Stuck in a jam on the M6 I contemplated driving out the hinge pins with a hammer and metal rod, thereby opening the dor from the wrong edge.
Anyway, this morning I gave the handle a good yank - it moved stiffly, and the door opened. You might be able to force your handle - they do in fact spin right round when removed.
I removed all the screws from the door edge, the handles and the lock cylinder to ease out the 6 foot or so mechanism along the edge - took about 5 minutes - you have to ease the door seal away with a flat screwdriver. I had buckled the lock casing wrenchig the handle, so the problem must have been a pin or something breaking or coming adrift. It needs a new mechanism obviously.
I took the mechanism to a local locksmith - The Lock Shop on Dickson Road in Blackpool. After sifting through catalogues, they found a similar mechanism, which they ordered - I should have it tomorrow. Cost me £86 plus another £6 for a new cylinder (optional) - I like to do jobs properly as the keys feel a bit loose with wear.
My front door is temporarily wedged against the porch wall with a wooden beam to maintain security.
Suggest you:
Find a local supplier that can order you a replacement mechanism
Early morning on a day when he is open try forcing the handle round further - maybe even with a length of pipe over it to get more torque. If this fails, try tapping out the hinge pins.
Then do what I am doing.
Hope this is useful,
Keith
Keith Wood, September 2004