Could the calendar be developed to sync automatically with say an Outlook calendar or similar?
Calendar: IMPORT or Subscribe to iCal feed into Moodle calendar
Well, you can load up your Moodle calendar in your Windows Calendar or Google Calendar (one way sync), because they all support iCal.
eg see ical button http://moodle.org/calendar/view.php
True, I think this chap works on his mobile and tinkers with appointments etc. then would like these changes that sync from his phone to sync with Outlook and filter through to Moodle I imagine - is that way possible?
Really, iCal is the only sensible way to do this. It's the standard for such things. See MDL-16660
Tackling outlook sync directly is probably out of scope for the Moodle project.