The city council always check the background using the DBS procedure and check if you have right to work in the work.
They contact the homeoffice and makesure your not an illegal immegrant or on any wanted list
Role dependent, frontline roles or those which work with vulnerable people will require one.
Some checks but not enough, criminals have slipped the net.
The pre-employment checks at the time involved references and CRB checks. These could take upto a month before employment commenced.