Yes dbs and drug and alcohol test.
None well not properly had illegal immigrants there ex offendersetc etc etc
I done this through school (work experience)
They require a full professional reference, a criminal and a health check. The whole process takes about three weeks.
They do check but the length of time it takes varies from person to person.
They ring the drug abilitation centre to inquire if your known to them and check with the homeoffice regarding illegal immigration
They only seem interested in white powder and hypodermics.