Latest development; After a short drive yesterday, its now billowing smoke out of the exhaust and the oil is now on the outside of the engine instead of inside! Difficult to tell where the oil is coming from until I clean it up a bit, but its on the manifold side, possibly from the head...

Further to the previous post - I've now noticed rather a lot of vapour (white/grey, presumably water vapour) blowing out of the rocker cover cap. Does this suggest the head gasket is blowing? The coolant level is ok and the header tank is not bubbling.

You might want to settle down with a cup of tea to read this one. It’s quite a saga…. A few months ago I became the proud owner of a 1991 Range Rover. Slightly unusual in that it was originally a V8 auto, but converted to a 300tdi about 10 years ago. Generally in fair condition for a Classic...