There were changes overnight according to the scan data but the changes were to complex to be analysed, the scanner's log just shows that further analysis is required. Analysis hasn't been done as there wasn't a post am scan, so there may be further changes.
Catch 22!!
There were changes to the NIT CDS section, which invariably gets analysed quickly as it means frequency changes, which the scanners need to have analysed so that they know which frequencies to scan. Apparently, mothballed TSID 19, which recently had all frequency data removed from the NIT, once again carries frequency data. Interestingly, the scanners didn't use the early extract of frequency data (which they had previously requested) - so I'll check what's going on there.