<sod >Ukip has also been campaigning heavily in the Lancashire constituency of Heywood and Middleton, where a by-election is also being held, triggered by the death of Labour MP Jim Dobbin who had held the seat since 1997.< eod>< sod > Ukip has also been campaigning heavily in Heywood and Middleton, where a by-election was triggered by the death of Labour MP Jim Dobbin who had held the seat since 1997.< eod>