In this, the first of a two-part enquiry into prisons and the alternatives to prison, JEREMY JAMES talks to the men who run Lincoln to find out why they do the job; how they measure success. If you are sentenced to a term of imprisonment it is to a local prison - like Lincoln - that you will probably go first. There you will meet violent men, petty thieves, those looking for warmth and shelter and the people serving the longest sentences of all, the screws - prison officers.