Almost 250,000 come for short-term work or study / ONS, 25 October 2007
PDF - http://www.statistics.gov.uk/pdfdir/mig1007.pdf
"The first experimental estimates of the number of short-term migrants to England and Wales show that overseas residents made 247,000 work or study visits of one to 12 months in the year to mid-2005. The estimates, which are still under development, have been published in a research report today by the Office for National Statistics."