well i got it directly from their information
Levels of CRB Check
To provide this service, the CRB offers two types of check. These are Standard and Enhanced.
These checks cannot be obtained by members of the public directly but are only available to organisations and only for those professions, offices, employments, work and occupations listed in the Exceptions Order to the Rehabilitation of Offenders Act 1974.
Standard CRB check
Standard CRB checks are primarily for posts that involve working with children or vulnerable adults. Standard checks may also be issued for people entering certain professions, such as members of the legal and accountancy professions. Standard checks contain the following;
Convictions, Cautions, Reprimands and Warnings held in England and Wales on the Police National Computer, the most of the relevant convictions in Scotland and Northern Ireland may also be included;
and if the position involves working with children or vulnerable adults, in the sectors or areas which are able to access them, and the relevant boxes have been marked on the application form, in Section Y (Y3 or Y4), to indicate this:
information from the Protection of Children Act List (PoCA);
Information from the Protection of Vulnerable Adults List (POVA); and
Information held by the DCSF under Section 142 of the Education Act 2002 of those considered unsuitable for, or banned from working with children