Update: I tested an IEC cable to confirm I could detect 240v and then tested between the earth of the IEC and the fixture and didn't get a reading. Also tested between the neutral of the IEC and the fixture with the same result. So I'm not quite as concerned now, but electrician will confirm.
I...
Is the following cause for concern?
>Voltage tester lights up when I touch the light fitting with light on.
>Voltage tester does not light up when I touch fitting with light off.
>Light is not grounded.
Will be getting an electrician out.