TD5 black plug in top of engine loose!

I removed the EGR this morning - (well worth while, runs much smoother now,) and whilst doing so noticed the front of the engine has quite a bit of oil on it. The large black plug that is on the front and sits betwwen the head and the tappet cover is loose, and it appears this is where the oil is coming from.

Should it be like this or is it an o ring or similar missing?

presume you mean injector loom connector ,it should have blue o rings on outer to seal in housing ,but oil commonly leaks into connector through loom from there to ecu

sorry James not a great description its the black disc at the top, not a plug there are no wires in it - should have taken a photo!!!! its about 40-50 mm diameter....

just had a look on Rave, its the camshaft sprocket access plug - looks like I need a new O ring!

Any idea where i can get one - none on ebay!!!

hehe

This is what you need.
land rover td5 camshaft seal | eBay