You do seem to have posted a hell of lot of questions about this matter but I'll still try to address the specific issues you've asked about this time.
If you were
solely banned from driving (which seems unlikely), the conviction is regarded as 'spent' as soon as the ban ends.
However, if you were also fined (or given a community sentence) then the 5 year rehabilitation period applies.
See here:
http://www.lawontheweb.co.uk/rehabact.htm
However
all convictions remain on your record
for life. If you appear before the courts again, the court will be made aware of your previous conviction when passing sentence. If a potential employer carries out a CRB check, your conviction will always show up. (That's set to change. The CRB are to introduce a new 'basic' check which will only show unspent convictions). If you apply for employment in a job which is exempted from the provisions of the Rehabilitation of Offenders Act (such as working with, or alongside children or vulnerable adults) you'll always have to declare your conviction. If you apply for a visa for foreign travel, the RoO Act doesn't apply, so you'll always have to declare your conviction (if required to by the application form).
Chris