Thanks people
Given what Adey has just stated, Im begining to think this could be nothing more than an insufficient power issue as the single battery was low (I thought it was charged!) and now the second battery is in, it seems fine!
I'll check that in the manual Saphire...could come in handy just incase something like this happens again
I supposed the benefits of the camera going up the wall would be the fact that I would have saved up and upgraded to the 20D
Silver lining and all that