Hi Declan, I'm searching in exactly the same way you did! I have the exact same ADE Optima Compact alarm, same panel. I have the 4-digit code but no real idea what I'm doing. The only information I could find is this link - https://www.tlc-direct.co.uk/Technical/DataSheets/Ade/ACCENTA6_8_User.pdf
Is this what helped you in the end or do you have another link? Thanks in advance