As someone who has read a large number of efforts on British colonisation, this comes across as a very good introduction of the Empire. All of the major historical landmarks from a global scale are covered but there are some flashpoints that get only a small mention,
This effort is hamstrung by its brevity and it is one of the few efforts where the Wikipedia entry is equal if not better. I will admit that this is probably because there is instant access to constituent entries. (I know which choice I would direct a student to for scholarship). I would use book only to pique the interest.