Hows does one reorganise the N810's application menus? Can I create new menu headings and can I move items from one section, e.g. 'Extras', into 'Comminications'?

Yes, see this tutorial:

http://tabletschool.blogspot.com/200...customise.html

or if you want a short answer, go to the Control Panel, double-click on Panels (at the very bottom of the screen) and click on the Organise button.

Thank you.