The Trust was formed in 1999 at a time when many hospitals were merged for administrative and managerial reasons, in an attempt to create organisations with sufficient 'critical mass' to deal with a range of patient services.
The two trust hospitals treat over 500,000 patients per year; these come not only from Barnet and Enfield but also from East Harrow, South Hertfordshire, West Essex and Waltham Forest.
Plans to rationalise some services between the hospitals led to a number of protests, including the formation of the "Save Chase Farm" party (2006-2010) which at one time had two members elected to the local council of the London Borough of Enfield.
Featuring over 300 members of staff from several departments washing their hands whilst dancing to the song, it became an unexpected online hit, averaging over a thousand views a day in the first week of its release.
This was released on YouTube in November 2013 and also became a minor viral hit, enthusiastically supported by both Mariah Carey's fan pages on Facebook and even the Metro newspaper.