Depends on the lecturer, gauge the relationship when you get there but they should all be fairly helpful and friendly. I've known some lecturers to be quite formal (use mr for name and very focused on only study talk etc) but most have been a sort of friendly in a professional way kind of thing, like you can get to know them a bit and chat like you would with a friend. I've known some lecturers that have been happy to kick back with a beer and chat during trips, or host tea / cake parties. You'll get a better sense of where things stand once you're there, just roll with the flow.