Well that sucks!
If they spotted it, I imagine it's an external leak so it's not too harmful. As long as you keep an eye on the oil level you should be ok
Old mate said its about 4/10 for severity. I will be going back in about a month so he can check it again and advise some more.
Have you had a similar problem with yours Morgs?
Old mate was really through and took the time to explain the work and show me exactly on the car what he was doing. I will be going back there for services.