So finally a chance test drive the car and it's no
oil weep, it's a leak from under the manifold.
Hopefully the video attached works and sorry can't make it up right.
At about 9 seconds in look at the underside of the syncro between base and neck and on each subsequent engine rev you will see
oil spurt out.
https://sendvid.com/rdurxvf3
Hadn't realized there were
oil passages linked to the manifold.
So obviously will start to tear down the engine but keen for feedback on where the oil is leaking from at the front of the manifold.
Cheers