Does the agency provide 24-7 support, 365 days a year? The requirement for Locum GP cover can arise unexpectedly and at any time, because of staff illness and other issues. Also, you want provision to contact the agency at the first opportunity if a problem arises concerning the appointment.

Consider your specific practice needs, and the type of experience and qualifications required of a Locum. For example, a 'walk-in centre' may require the GP to undertake child immunisations and similar tasks usually performed by a practice nurse in other surgeries. If you offer family planning, a DFFP qualification will be required. Also, consider your IT and other internal systems - is familiarity with EMIS an advantage, for example?

Are there thorough and consistent checks by the agency of each Locum's credentials? This should include G.M.C. and JCPTGP accreditation and PCT Supplementary listings. Follow-up checks on at least two job references are also essential.

Does the agency conduct checks for CRB (Criminal Records Bureau) Enhanced Disclosure? This is mandatory for all teachers and is considered a sensible precaution for Locums, who may come into contact with children and vulnerable adults, to ensure there is no criminal record of concern.

If the agency accepts postal registration from prospective Locums, does it insist that all photographs that are submitted for ID purposes should be validated by a GP who holds a substantive position, and are the GP's contact details provided, to enable checks?