intfin

Got a REALLY annoying,but seemingly small oil leak coming from the top left hand side of the engine(as you're facing it from front). Can't determine where it's coming from. there is some oil pipes running across the top of the engine-wondering if it's a dodgy connection on these?/Rocker box Gasket faulty?Difficult to see-does'nt seem to leak on tickover.Any thoughts please?