Least surprising lawsuit of the week:

British manufacturer Dyson is suing Samsung over claims that the South Korean firm "ripped off" one of its inventions.

The dispute centres over the launch of the Motion Sync vacuum cleaner which the South Korean firm showed off at the Ifa tech show in Berlin last week.

Dyson alleges that the machine infringes its patent on a steering mechanism for cylinder cleaners.

A spokeswoman for Samsung said it had no comment on the matter.