UK Car Repair: oil leak, oil leak, oil pump

Question
hi got 99 2.2 diesel frontera and got an oil leak from rear of engine it not the rocker gasket as i have done this also there is like a servo/oil pump on the rear of the engine thats been of and sealed yet its still leaking oil

Answer
It's probably the camshaft seal - If you get some soapy hot water and scrub that part of the engine clean, then go for a quick drive you'll see exactly where the oil is coming from - If you could take a photo of it I can tell you 100% where it is coming from.