I believe the Reps territories have changed and the SW rep now covers Hampshire, W and E Sussex and Kent in addition to the SW. This could explain why one model is available in some counties and the others in more.
People tend to forget that the internet is only ONE form of communication there are plenty of others. Some people prefer to speak to a human and verify their exact needs. That is why some people still visit shops and do not do everything on line
After being at two exhibitions when somebody ran a pair of 20s at full chat on a DEPOT layout every five minutes for two days the thought of music every five minutes for two days would make me stay away