Free eyeOpener Gallery Tours
These short tours (30–40 minutes each) introduce different areas of the museum's collection, led by volunteer guides. They are daily so check the timetable to plan your visit.
These guides are available for a small fee and have a detailed insight into over 200 objects in 61 galleries. There's an audio commentary along with images and an interactive map. It is available in 10 languages.
I've tried the British Museum Highlights Tour which takes you "around the world in 90 minutes".
Click Next => British Museum Highlights.