I disagree with many of the statements made that the data should only be used for electoral purposes.
Point 1, people have the right to witheld from the edited form of the electoral roll register.
if they can't work out which box to tick on the form, then should they even be receiving a voting form in the first place?
Point 2: The electoral roll register has been and currently is available in libraries of towns/councils and this has been the case for many, many years.
To prohibit the distribution of the data, and presumably prevent even libraries from holding this information is going to reduce the level of access that has been provided for many years, before IT came into existance. This is wrong.
The level of access that is provided with online databases holding this information is invaluable, it is not necessarily used for criminal means, althought that is possible.
I have used to electoral register online to locate people that owe me money, and then I've taken them to court. I've used it locate old friends, I've used it to track down law breakers too.
I've used it for myself and I've used it to help others too, for quite legitimate reasons.
I see nothing wrong with the situation as it currently stands.