Thanks for the replies. As to what Chromebook is, I'll let wikipedia explain:
A Chromebook is a laptop running Chrome OS as its operating system. The devices are designed to be used primarily while connected to the Internet, with most applications and data residing in "the cloud".
I'll wait for a definitive answer before purchasing. My son is really looking forward to playing it. If it does transpire that he can play it on a chromebook, then I'll also think about picking up the English parliament version, too.