Being missing won't show up. If you have been sectioned, it will show on an enhanced CRB check, which since you are looking to work with children is the type you may well need to get depending on the type of work you are looking to do. Whether you have to get it yourself or whether the organisation will depends on their size, either way you will be required to fill in a form with details such as NI number and passport number et al (Sorry, I have worked in HR department where we dealt with them)
Best place to check is
http://www.crb.gov.uk/Default.aspx?page=406
where I found the following:
"Enhanced CRB Check
Also referred to as an Enhanced Disclosure. These are for posts that involve a far greater degree of contact with children or vulnerable adults. In general the type of work will involve regularly caring for, supervising, training or being in sole charge of such people. Examples include a Teacher, Scout or Guide leader. Enhanced checks are also issued for certain statutory purposes such as gaming and lottery licences.
This level of check involves an additional level of check to those carried out for the Standard CRB check - a check on local police records. Where local police records contain additional information that may be relevant to the post the applicant is being considered for, the Chief Officer of police may release information for inclusion in an Enhanced check. Exceptionally, and in a very small number of circumstances (typically to protect the integrity of current police investigations), additional information may be sent under separate cover to the Countersignatory and should not be revealed to the applicant."
From what you have said, nothing should show up on it and it should not cause you any issues.
Roiben
