Public Health (Control of Disease) Act 1984
Preamble: 'An Act to consolidate certain enactments relating to the control of disease and to the establishment and functions of port health authorities, including enactments relating to burial and cremation and to the regulation of common lodging–houses and canal boats, with amendments to give effect to recommendations of the Law Commission.' Its Part 2A was inserted by Part 3 of the Health and Social Care Act 2008, and includes s45G ('Power to order health measures in relation to persons') which provides, among other things, in specified circumstances for the detention and quarantining of an infected person in a hospital or other suitable establishment.
In force dates
Part 2A: 'July 21, 2008 in relation to enabling the exercise on or after July 21, 2008 of any power to make orders or regulations and defining expressions relevant to the exercise of any such power; April 1, 2009 in relation to England for purposes specified in SI 2009/462 art.3; April 6, 2010 in relation to England; July 26, 2010 in relation to Wales otherwise' (source: Westlaw)
Public Health (Control of Disease) Act 1984 on UK Legislation website. At the time of writing the UK Legislation website is not up to date, but Part 2A can be read in the link below
Health and Social Care Act 2008, Part 3 ('Public Health Protection') on UK Legislation website. This Part inserts Part 2A into the Public Health (Control of Disease) Act 1984
BBC, 'TB treatment man Gary Clayden at Blackpool hospital' (19/7/11). In this case a s45G order was made but not used because the infected person attended hospital voluntarily