Deposits into the Natwest Euro account are charged a fee by Natwest that varies from 1.18 Euro upwards because it is a cross border transaction. It has not been explained why this charge varies. 

Ezybonds plan to have a Euro Bank Account within the EU to avoid these cross border charges. 

Ezyaccount holders, at the time of deposit, are advised to accept all charges and fees to keep the unique deposit amount complete.