OK, here's the problem:
In iOS7 UDIDs are no longer available via the "send me my UDID apps.
UDIDs are ONLY available via Xcode or connecting to itunes.
The ones sent by the apps are incorrect and will fail - they all have FFFFF as the start...
To find the correct UDID, connect to itunes.
click on:
My Device->serial number (it will switch to the UDID)
grrrrr..............
Very nice woman at Apple walked me through it.
S