Just a warning to anyone using Amazon Buy Shipping where the parcel is going to Channel Islands
Amazon do not create the required CN22 Customs Form for these orders which are a requirement. Presumably they will not be sending the HS Codes electronically as well (not sure if these are required but better to be safe then sorry).
If you put these orders through RM C&D then CN22 etc is generated as expected so for no it might be advised to create a Shipping Rule to direct such orders via RM C&D and not Buy Shipping.
Thank you for the helpful info