Joanna Mills explains switch to Great Britain and NI team

Joanna Mills explains the reasons behind her switch of allegiance to the Great Britain and Northern Ireland team.

Mills was left to consider her future after being omitted from the Ireland 4x400m relay squad for the London Olympics.

The Ballymena and Antrim runner also reveals that she was she may have to serve a ban resulting from the move, which she said was "a difficult decision to make".