Hi Kid
Thanks for the answer. I would just like to feed back that when I was looking at Users -> Active Users -> Assign Licenses, I was shown 34 Business Premium Licenses, not 9 Paid Business Premium Licenses + 25 Business Trial Licesnses. It was this confusion in the interface that led to this question.
A member of the call centre team called me back yesterday and gave me remote assistance to provide assurance also - all seems to be well today, so thanks for your help.