** Update **
After a lot of communications, the end result is, As per FAA DAR, we need to obtain a letter, "Statement of Conformity" for the aircraft, which will be raised by Airbus Helicopters and then sent to the DGAC for certification.
Next question:
Does anyone have the contact details for DGAC Certifications, who would deal with this?, I know one of the last posters did mention two people, but has since removed their post.
Thank you all for your input on this matter, very much appreciated, it certainly gave us different lines to go down.