Splitty Oil Leak

Hi...
May 64 splitty has developed a bad oil leak at the engine/gearbox point somewhere. ( cant tell where exactly as its all caked in oil/grime) I know its not engine oil as the level hasnt gone down..

Its still running the original reduction boxes etc.

What seal could it be? Any help?

Thanks

Jay

at the engine/gearbox point somewhere - i would be it is the front engine seal. It is behind the flywheel. It should be leaking slowly at the gearbox engine join.
Engine out job. Actually its a "may as well do the clutch" job