Okay just while I have some time, I just went to do a test shot and firstly noticed that there was no display in the viewfinder. I continued to fire the shutter and yes unsurprisingly it stuck. Now there is no release with the check and nor does removing the batteries, which had worked in the past.
So these batteries are just three days old and it would seem they may of had the life sucked out of them. Unfortunately I dont have another camera to test on.
Is this what it could all be about, an issue with battery drainage perhaps?