Thank you for posting in the e-z Cert forum. There are e-z Cert training courses available at various Chambers of Commerce across the UK. To be able to apply for certificates in the UK you will need to register with a Chamber and complete a Formal Undertaking. I suggest you find your local chamber via this map:
You can setup an e-z Cert account to apply for certificates with your chosen chamber here:
Certificates of Origin and EUR1's are for different purposes. The EUR1 can gain a lower or nil rate of import duty in the destination country is part of the EUR1 system. The Certificate of Origin will prove the origin of the goods you are shipping. You might take guidance from the customer as to what documents they require.
If you have any further questions please do not hesitate to contact us again.