It appears to me that there is a complete lack of co-ordination between the two Boroughs. The speed limit always used to be 30 mph along Honor Oak Park and remains so on the Lewisham side. But Southwark decided to change their side to 20 mph. At the border the signs are very unclear or non-existent. If you drive from the Southwark side into the Lewisham side, there is no sign that indicates that the speed limit is now 30 mph (or, at least, I don't recall seeing one).