With the Bank of England worried about inflationary heat in the jobs market as it considers when to stop raising interest rates, the Recruitment and Employment Confederation said cautious employers were relying increasingly on temporary hires.
Billings for temporary workers last month rose at the fastest pace since September, pushing up pay for those workers.
By contrast, hiring of permanent staff fell and their starting salaries grew at the slowest pace in 21 months, although the rise was still big by historic standards, the survey showed.
There were some signs of increased confidence among employers as the pace of growth in the number of vacancies posted for permanent staff accelerated for the first time in nine months, REC said.
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