Seeking Vengence? - Work for your Local Council!

So from today all our web activity is (officially) to be recorded for at least a year and accessible to "hundreds of public authorities, quangos [and] local authorities". Critics of these powers often invoke notions like 'the police state' in making the case against them. But I've a much more mundane concern playing on my mind. Suppose I live next to someone who works for the Council and I've annoyed them in some petty way (maybe I didn't invite her to my house party). If she has decided that she wants to get even with me, what stops her from finding out what websites I visit? You could cause absolute havoc armed with that sort of information!