It all depends if they check or not. Obviously in your case, they did not check the license against residency, which is not really surprising for a speeding offense.Bassman wrote:
I have been caught for speeding on a few occasions (twice with just 1km/hr over the limit after the 5% deduction) i just sent a photocopy of my (credit card) license and the payment, thankfully no one has said that i must change to a French license.
I also did this for many years but I know a few people that did get caught and made to change, not by the DVLA but by the authority of the country in which they were living. After an accident or at the border, they are more likely to do a more thorough cross reference check.