Hi Gary, thanks for the pointer - all working as expected 
I added in switchport mode trunk just under interface port-channel 1 as it keeps setting to Hybrid and not working otherwise.
Can you clarify what the ! does in the code? Is there a reference guide on the snippet CLI and what needs to be included/excluded?
I only ask as in this post, it shows config-terminal and end is included. How do you know when/what to include or exclude?