Nintendo has apologised that its TVii service is still yet to launch in Europe.
TVii launched alongside the Wii U in the US, but was scheduled to make its debut in Europe at some point in 2013. Which didn't happen. Pressing the TV button on the GamePad is therefore significantly less fruitful in Europe, basically.
"Please continue to keep an eye out for further announcements regarding this service in the near future."
In the US, TVii amalgamates cable and satellite service alongside Hulu Plus, Amazon Instant Video, and Netflix into the Wii U GamePad, functioning as a nifty programme guide that can then display shows on your TV or on the GamePad itself.