I've certainly seen a few - I also spot them on their first days by the distinctive white coats!
Pick a hospital or medical school, work any contacts you have, but otherwise just look people up off the internet and write to them. Personal contacts probably work better than through the medical schools, because we don't really have elective rotations in the same way that you do in the US, so the system isn't really set up for it.
That said, if you go to a hospital that takes medical students, they certainly won't mind you going to their teaching sessions. You can also go the the F1 teaching sessions, which can be good.
So in summary, pick a subject, pick a place, and get writing!