The "Freeview Live TV" application is not pre-installed to the SV10, it is supposed to auto-install during initial setup, though this does not happen under the right conditions. Such as not logging into a Google Account, or the Google Account used is registered outside New Zealand. The "Freeview" button will not do anything if the "Freeview Live TV" application is not installed.

Solution 1: Ensure you've logged into a Google Account.
1. Press the Google Home button.
2. Select Settings in the top-right.
3. Scroll down to Accounts.
4. Ensure a Google Account is listed.
5. If not, select Add Account.

Solution 2: Manually install the "Freeview Live TV" application from the Play Store.
1. Press the Google Home button.
2. Select the "APPS" icon and press OK.
3. Select "GET MORE APPS" to open the Play Store.
4. Select the "Search" option at the top-left.
5. Enter "Freeview Live TV" into the search field.
6. Install the "Freeview Live TV" application.

If the "Freeview Live TV" application does not show in the search results, it means the Google Account used is not registered in New Zealand. In which case, you made need to register a new Google Account.