Update on the situation,
I was able to get the AP205H working with the correct configuration but only breifly. When I unplugged the AP the AP would not power the phone again because it was not receiving enough power from the switch. To get it working again we had to change the configuration on the switch from trunk to access then back to trunk.
From all of this it seems that there is an issue with the LLDP negotiation between the switch and the AP. I am not yet 100% convinced that this is the issue though.
Does anyone have any ideas about this?
Christopher