Pay per day ranged from £280 to £690, compared to a range of £300 to £700 reported 12 months ago (GP, 13 January 2006).
More than 400 locums who took part in the latest survey earn £392 a day on average.
Dr Richard Fieldhouse, chief executive of the National Association of Sessional GPs (NASGP), warned that locums may be charging too little.
GMS GP profit per partner for 2005/6 is expected to reach around £120,000, including non-NHS earnings. Dr Fieldhouse said locums should be earning an equivalent amount.
Based on an average of 46 five-day weeks, he said that locums would have to charge just over £500 a day to achieve an equivalent level of earnings.
Locum day rates start at around £300 throughout the UK, the survey shows. The highest rates, of £600 or more per day, were found in England — in London, Yorkshire, Humberside and West Midlands SHAs.
In Scotland, the highest reported rate per day was £450. In Northern Ireland the highest rate was £500 and in Wales £555.
The highest-paid locum in the UK, in the Yorkshire and Humberside area, earns £690 a day without home visits.
The lowest-paid locum, in the South Central SHA area, earns £280 a day including home visits.
Locum rates table
Download a PDF of the locum rates table.