You must fulfil the following legal requirements:

• Hold a full UK or European Union (EU/European Economic Area (EEA)
  unrestricted car driving licence

• Have held it for a total of at least four out of the past six years prior
  to entering the Register after qualifying

• Not have been disqualified from driving at any time in the four years
  prior to being entered in the Register

• Be a “fit and proper” person to have your name entered in the Register:

  All convictions, motoring and non-motoring, will be taken into account
  when they assess your suitability to be entered on the Register.

  From Spring 2007 applicants will be required to have an enhanced
  level criminal record check. The information from this check will be
  used by the DSA to assess the suitability of persons applying for inclusion
  on the Register of Approved Driving Instructors.

• Pass the two qualifying practical examinations within two years of passing
  the theory examination

• Apply for registration within 12 months of passing the final part
  of the examination.

Criminal Record Checks...

The DSA introduced criminal record checks for Potential Driving Instructors
and Approved Driving Instructors in Spring 2007.

The DSA will be using the services of the Criminal Records Bureau to obtain criminal record
disclosures for individuals normally resident in England and Wales, and of Disclosure Scotland
for individuals normally resident in Scotland