Чиято длъжност е от ключово значение за обществото.

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Note added at 18 часа (2013-06-14 13:41:11 GMT)
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Key workers are people who work in certain public sector jobs based in England. (...)
clinical NHS staff (except for doctors and dentists)
teachers and nursery nurses in schools and further education or sixth form colleges
police officers, community support officers and some civilian staff
prison officers and some other prison staff
Probation Service staff
planners working in a local authority
firefighters and some other uniformed staff in Fire and Rescue Services
Connexions personal advisors employed by a local authority or a Connexions partnership
Armed Forces personnel and Ministry of Defence clinical staff, Ministry of Defence police officers and uniformed staff in the Fire and Defence Service
qualified environmental health officers/practitioners who work in a local authority, government agency, the NHS or other public sector agencies
Highways Agency staff in certain safety roles in the traffic officer service
social workers, nursery nurses, educational psychologists and therapists (eg occupational therapists) employed by local authorities, the Children and Family Court Advisory Support Service or the NHS.

http://www.lambeth.gov.uk/Services/HousingPlanning/HousingOp...

Това са важни за обществото професии, които обаче не са достатъчно добре платени, за да си позволят практикуващите ги да си купят жилище, ето защо за тях съществува специална програма, за което трябва желаещите да се възползват от нея да отговарят на определени условия:
http://www.reigate-banstead.gov.uk/housing/finding_a_home/ke...