CRB 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.
For this reason your application will be processed either by your employer, if it is registered with the CRB, or a third party organisation, called an Umbrella Body, which is registered with the CRB. Link: www.crb.homeoffice.gov.uk/
CRB requirements are determined by an employer, not the individual.
CRB clearance with an organisation does not give cover in private practice.
CRB checks are not required for working in private practice.
For guidance when working is schools, there will clear policies and it may be helpful to contact your local education authority for local information
For an update on the latest government guidelines for CRB check please see the following letter - CRB UPDATE LETTER