all the old codes will have been converted in the system already so when he gets the new licence it will have the same entitlements converted to the new equivalents. Some of them will be codes with a note code attached but essentially he will have the same entitlements. For example when I passed my test, code A was a standard manual Car, B was an automatic only etc.Now A is a motorcycle B is a car. etc There are still codes for all the stuff that ever was there so the track laying/odd vehicles entitlement will be there just represented slightly differenty. WARNING DVLA have been known to lose things so make a copy of the old licence.