May I suggest finding out the names of the heads of the department/s involved. (Freedom of Information and other such Skullduggery.) Follow them them to and from work regularly, check that thier motor vehicles are taxed, ensure they commit no parking and/or driving offences.When vehicles are spotted outside peoples houses enforcing this RIPA bollix circle the cars several tinmes to ensure that they are not prowlers and/or terrorists. Get police to check that they are indeed Pooles of Piss,(sorry couldnt resist it!) There are not that many turds doing this work,and said turds should soon get the message, especially when they get followed home and the good old unmarked white van spends time at their abode.