Ah yes, silly of me. It’s 200tdi. Head gasket and cambelt was changed (see my other thread). About a week later I was driving home from work and the oil light came on, I had to limp a few more miles to somewhere I could safely stop. Engine making awful noises. I think the oil pump failed as oil level on dipstick was fine. The worry is that the big end has gone and the engine has seized. I had it towed to the garage that did the head gasket and cambelt, as at that stage I had no idea what the issue could be.
Important to note that I’m not a skilled mechanic, just trying to learn a few things as I go along.
As it stands, my Defender is at a garage, waiting for the issue to be diagnosed.