We are automatically on the Electoral Roll here in the U.K if we are residents. As soon as I left I decided it was my civic duty to vote, and I have done so many times.
A couple of local things I have missed out, because the candidates could not be arsed to publicise who they were, and what they stood for, lazy bastards, if they can't be bothered to do that then I can't be bothered to vote for them.
I have wondered if the local Elders would take action if they had proof of my voting, similarly with my donating blood, if they did, just think of the fun I could have giving publicity to their silly stance on these matters !