I've just re enrolled my eldest children in nippers (surf lifesaving). Any parent who wants to help out and get involved needs to have a "Blue Card" or Police Clearance. Any person working with children in childcare etc needs to have the same. The DT are deluded if they think OP will be welcomed by those children's parents.
Extract from South Africa concerning Police Clearance Certificates
Can a Criminal Record be removed or Expunged?
Yes a Criminal record can be removed or expunged under certain circumstances for example.
A fine of not more than R 20000 must have been a option.
No jail term must have been done.
No sexual offence.
Please go to Expunge mint for more details.
Who needs a Police Clearance Certificate?
There is no hard and fast rule but the following can be taken as a guideline
for a person 16 years and older who wants to immigrate, work or study in a
foreign country you and your dependants may have to provide police certificates.
Visa offices may also request certificates from students and foreign workers.
Wants to Emigrate.
Wants permanent residency.
Wants a work permit.
Certain Visa applications.
Certain types of occupations
Usually you must obtain Police Clearance Certificates from countries you visited for more than 6 consecutive months at a time.
http://www.policeclearance.co.za/policeclearancecertifcate.html