The names and addresses of people involved in planning permission cases are available on the Web for all the world to see. Therefore your name and address is in the public domain, and there are no data protection issues.
Anyone can pull the names and addresses off the website (you don't even need to register for an account).
One could question whether the planning authority has the right to publish the names and addresses on the Web, but I'm sure they do, isn't part of the planning process a requirement for the process to happen in public, through newpaper statements, and posted signs.
It would be an interesting case for someone to take, to try and have their name and address witheld from public notices about planning issues.
-Rd