I've come away from the office with my laptop but forgotten the charger so I can't use Creative cloud on it. Is there any way I could run it from my home desktop for one week only?
Yes, you can.
On you home computer, download and install the application from creative.adobe.com website.
On launch, it will prompt that it is already activated to 2 machines. Select the option to deactivate from already activated machines and use it on home computer.
After a week, use the same workflow to get the application working on laptop.