Steve I have poked it with a pointy stick
conclusions
4637 works, copied the screen set ( latest one)
tried 4707 with the copied screen no go
as a sanity check on my part compared the screen set that worked and the one that did not zero differences
so I have raised a ticket ( phone is no use , I cannot lip read a phone , I can hear a bit but to pass info is a no no )
thanks again