Rob Summerton is a social worker that is drafted during the officers strike. He has the time to establish that he has a wife and small kids before he is stabbed to death with a skewer by Bev Baker.
He likely has the shortest appearance on the show by any named character in the ending credits. He was played by actor Jeremy Kewley. Kewley became a prisoner himself in 2016 when he was sentenced to 23 months in prison for child sex offences between 1989 and up to the time of sentencing.