No taxation without representation?

I pay all my income tax in Britain, but I am now disenfranchised. I have lived in France for seventeen years, but intend to return to Britain eventually. Why do I no longer have a vote? It should surely be possible for those of us who wish to continue voting to register. The argument is that too few ex-pats wanted to vote, but what if we do? I understand that French ex-pats are represented.

I pay my taxes; I want to vote.