Thanks for the reply Benson.

I wonder if you can suggest how I might get the Xomap package. The rotation support page says that you must "still update Xomap manually," but the link just goes to the page describing Red Pill mode. I assume you must be in this mode to do the update, but this doesn't describe how to do the actual updating.

I fear I'm still at the stage where instructions like the ones qwerty12 gave are extremely useful.

Thanks again to all.