Moderation in all things
Getting caught - here real Police have been replaced with Cameras. Cameras can catch you at speed yet I can drive at 80 (10 over the motorway limit) and be safe and get a camera ticket, or drive like a d**khead at 60 and I won't be detected at all. Some areas don't even have traffic police and I haven't seen on on a motorway since May. Maybe this will change with the new uk.gov, although I doubt it - scameras are much cheaper.
Limits - Here police have a threshold - usually they will let limit + 10% + 3mph go with no action or a wagging finger and a telling off and no ticket, or if a camera you won't get anything. Over that and they will probably go for the points.