I am now nearly ready for knife-edge action! Just a couple of things to get right in my mind.
Our new BES has a different computer name from the old one, does this matter? The BES installation is still the same (blackberry1).
Other than that I have fulfilled all prerequisites, BES 4.1.4 is installed on the new sever. As far as I can see all I have left to do now is back-up the old server. Upgrade the old BES to 4.1.4 and then follow the instructions in KB03112
to copy the database across.
Hopefully I'm not missing anything!