Why is the Royal Pharmaceutical Society of Great Britain one of the UK public bodies with the power to monitor people's private communications?

Why is the Royal Pharmaceutical Society of Great Britain one of the 653 public bodies and quangos in the UK that have the power to monitor people's private communications and carry out surveillance? - See http://www.opsi.gov.uk/acts/acts2000/ukpga_20000023_en_12#sch1

Pretty sinister, in my opinion...)o: