(28 Oct 2015, 9:51 pm)nk55 wrote I know this may open a can of worms, but there is an issue of privacy under the convention of human rights, if someone does not wish to have their photograph taken whilst undertaking their employment duties, the photographer could find themselves in court!!
Taking a photo in a public place is Always Legal - No-one has the right to refuse to have their photograph taken in a Public Place or Area (Not even the Police).
Shopping Centres, Airports etc.. are privately owned areas and therefore permission may be needed in these areas. Bus Stations maybe considered similarly private land.
Subject is covered extensively in Photographic Journals.