This is Nick, the creator of the GDPR Data Classification & Cyber Security spreadsheet template!
I'm the founder of www.booleanlogical.com, a resource site for cyber security, data protection, and free IT resources, as well as the author (and contributing author) of numerous books.

There also a video walk-through of how to fill out the GDPR Data Classification & Cyber Security spreadsheet template on my site. If you have any questions, you can reach me at info@booleanlogical.com

Cheers!
Nick