Managed to get this job done today. ( The picture was stuck to the glass )
With the customers permission I soaked the picture & broken glass in a plastic container half filled with warm water. Today after two days soaking I finally managed to get all the glass off. Dried the picture then scaned it again. Odd light tear here and there but repairable in photoshop. Not the best picture to work with but an improvement on what we had.
So the customer will be pleased and so am I as my nearest competitor ( Who apparently does not like me, Its a bit of a territory thing plus he went to College to learn Photograhy and gives the impression that he his better than most of us round here ) had the picture for a ages then said it could not be done..
So should any of you come across this problem you know what to try.. No chemicals just warm water and patience