Hi mam2girls,
The BDA run courses all the time for the OHE. Get your dentist to look into it for you. If they are a member of the BDA you can get a reduction on the fees and the exam.
As for the imps courses they are usually only a day long and your dentist should let you go on one closest to you on a work day, if they nice you get paid so it won't affect your child care!
Jobs a good un!