Has mechanical clocks' time passed?
It was not long ago that inventors were borrowing inspiration from science fiction for the mobile phone. It soon became "smarter", then touch screens were followed by countless more smart devices.
Now, could it be time for the smartwatch?
Marc Cieslak discovers how far time has come since the tower containing Big Ben was built.
The programme will be first broadcast on Saturday 25 May 2013.
23 May 2013
- From the section Technology