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That would be Samsung.
O2 firmware only effects the os marginally, a bit of branding, some bloatware, APN & calling functionallity and network lock. And the Oreo update would happen regardless of its presence or absence. That's to say nothing 02 does or doesn't do will impact when Samsung decide to release the update for your 02 variant.
Oreo for S7 has only reached Korea so far, officially.
That assumes a linear relationship between Region Country, Telco, Telco Country Operation, Manufacturer, Device, Model and Version by region, country, operator, manufacturer, device, model and version which doesn't exist as it would be unmanagable.
Loosely somewhere in Telefonica and Samsung EMEA a process driven ecommerce purchasing/testing/approval loop exists that handles the firmware lifecycle process, across the portfolio. O2 will have little to no imput.
It's taking forever
You can always tap the 'android version' under >settings>about phone. If you tap it 7 or 8 times you get a visual representation of the android version , a lollipop, N for nougat or an Oreo, and if you tap or long press that other exciting things happen! 🙂
Also it's not like moving from 7 to 8 is going magically transform your phone, like it were a new one - mostly that changes are not huge, and in the background, and sometimes you find that apps which are no longer supported stop working.
So less there is a specific feature of 8 you are waiting for? then it's best not to get your hopes up too much.
Track usage, upgrade and get support with the My O2 appDownload My O2