Wheres the oil coming from?

Hi everyone,
New member here, I've got a 1988 defender 90 with a 200tdi from a discovery in it. I was wonder if anyone could help me out with where this oil might be come from?

There is a large amount of oil leaking, when the car is running.

The photo is a bottom up view of the suspect area with the other photo showing where this is under the bonnet?

Thanks in advance
C

turbo drain,might just need nipping up or perhaps a new pipe

Thats the turbo oil return line, if it is leaking from above then it could be the main oil feed to it