I have the same issue on my ED 30 and the specialist I go to for servicing etc said its relatively common and not to worry unless the leak is severe. Given that I'm not eating oil and no other problems he suggested holding on until I have the next cambelt/water pump change and then he can have another/closer look as he thinks its just a minor fault with the engine design and shouldn't cause any problems.
Put me at ease seeing others have this leak as well tbh but I appreciate it would be nice to clear it up. I get oil in that area but no dripping oil on the drive etc.