Jobs that definitely will not accept an applicant with a criminal record

Police
Depending on the seriousness of the crime, some criminal records won't stop you joining the police. But for most serious cases you will probably be disqualified. In the end, your chances of joining the police force, if you have a police record, are at the discretion of the Chief Constable of your chosen force, who will review your case.

Working with children
A very sensitive area at the moment for anyone with any kind of record. Because of the nature of this vocational area, you will probably be subject to a police check. You will be asked to complete a form to confirm that you have no criminal convictions, which might prevent you working with children and vulnerable people.

Teacher
Rather like the previous, teachers work primarily with children, and so police checks might be appropriate according to the sort of school you teach in.

Financial Institution Employee
Banks are quite strict about who they employ. Even after a successful job interview, the bank will check your credit rating, to see if you have had any financial problems in the past. The criteria used will not be the same as if you were trying to purchase a financial product, but your finances should illustrate your ability to manage your own money as well as customers. If you have been or are bankrupt or been guilty of criminal convictions, then it is likely you will not be offered a job. Customers expect trust from their financial institutions, therefore any question marks up on your ability to deliver that trust, will be looked at negatively.