Turns out its not seized however there is something inside the bottom end which is catching at times during the rotation.
I had a Cambelt and water pump change 5 months ago at a local independent vw specialist. Looks like that's been leaking and the Cambelt has shredded and worn down to roughly half width in one place. I haven't personally seen it yet hoping to tonight.
But my dad went up last night and couldn't believe it.