Poor visibility junction
The majority of motor traffic turns right from Union Road to head north on Radcliffe Road, and vice versa. Radcliffe Road is a home zone southwards of this junction, with associated streetscaping, and NCN 23 follows the length of Radcliffe Road.
The main problem is when heading North, where some nice streetscaping prevents drivers having a good view of any traffic exiting the home zone. A lesser problem is when heading South, where motor vehicles often pull out in front of you (presumably because they think that everyone will be turning left).
The most obvious quick fix would be to put a stop sign at the end of union road.