Just to follow up. This is the setup at the minute...
Master Controller (3600) - IP Addr 10.93.160.15, located in Data Centre QI
Local Controller (3600) - IP Addr 10.93.160.20, located in Data Centre QI
Local Controller (3600) - IP Addr 10.93.161.20, located in Data Centre BAS
AP belmis-crit-ap01 originally configured with AP Group UK-QI-OFFICE has an LMS IP 10.93.160.20 and backup of 10.93.161.20
when this AP is provisioned to the new AP Group of UK-BAS-OFFICE it boots with the saved LMS IP of 10.93.161.20 and this is the point when it shows on the master controller, not the local, but starts the reboot cycle, approx every 10 minutes.
The new AP group specifies the LMS IP 10.93.161.20 and the Backup LMS IP 10.93.160.20 (the reverse from the original AP Group)