After being pulled from shelves due to safety concerns, the Nest Protect smart smoke alarm is now available to buy once again.

The alarm was pulled after Nest discovered a glitch in the Wave feature that could deactivate the alarm without the owner even realising - thus completely defeating the point of a smoke alarm.

That feature has now been completely switched off in the new version and will be reinstated once Nest has fixed the problem.

But as a sweetener, Nest also announced that the price has been dropped from £109 ($199) to £89 ($99) for both the wired and battery versions of the gadget.