I don't know the specific model, however, after first checking that you really have removed all the fixing screws/bolts I would use a mobile phone case splitter to break the sealant around the handle.
An old credit card can also be used. If it will not budge, I would suggest you have missed a bolt somewhere.
Sorry to be a bit vague, but hope this helps a little.
Thanks for the reply . I have taken out all the scews and the lock/handle hangs loose but still connected on Botha sides of door. I was thinking maybe a pin in the mechanism or something. Any further thoughts. Cheers G
If it is like a car door handle, there will be a cir-clip holding the activating rod in place. I suspect you will not have cir-clip pliers to open them, so you will have to be creative with removing them.