OK here's my intended last post on this forum...
Ground staff don't always know about wheelchair pax on board so if a radio call is possible it will be much appreciated. The greater the accuracy of the information in the radio call, the better prepared we can be. It also avoids us having to tie up valuable (read:scarce) resources like ambilifts on flights which don't require them, so they be used on flights that do.
Thanks all for posting your opinions and points of view.
Happy flying!