G4 - Glance View on O2 UK?

[Stwutter]

I know that 'Glance View' (where you press and hold the screen whilst off to pull down to glance at the time) is supposed to be a feature on the G4, but it doesn't work on my O2 device in the UK, and I can find no setting to enable/disable.

I've had a Google, and it seems some US carriers have disabled this, but not others. Does anyone know if this is the case in the UK too, or am I missing the setting completely? It seems a totally pointless thing to disable, if so.