Actually didn't have to do anythnig
1). master publisher moved to the other cluster member
2). logging onto old master publisher and doing a show license gave me the activation key for that server and none of the other licenses
3). logging onto the new master publisher (cli) and doing a sh license showd that all the licenses had moved over to the new master publisher
4). logging onto the new master publisher via a web interface did not prompt me to activate the server
5). logging onto the old master publisher via the web interface also did not pormpt me to activate that server
The only thing I had to "tweak" was some custom clearpass guest stuff not associated with the actual master publisher move
Rgds
Alex