No, that really IS my surname!

Southern Electric are total muppets. Accessing their site using FF3 under Linux shows nothing but the Flash background (I hardly ever find sites that are completely broken these days). Not only that, when I  try to update my profile, they tell me to choose a “proper” surname!

Could there be a less effective wording for an “invalid character” message? When it comes to something as sensitive as people’s names, if you can’t parse characters in them, just silently replace with spaces on submit. What Southern Electric are doing is just insulting.